You will be shown full-text from a biomedical research paper. Given this text, your task is to extract all unique entities of the following types: ["Chemical"].

Please return the output as a JSON object of the format: {"Chemical": ["Carbon monoxide", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Document text:

7′-Phenyl-1′,3′,5′,6′,7′,7a’-hexa­hydro­dipiro[acenaphthyl­ene-1,5′-pyrrolo­[1,2-c]thia­zole-6′,2′′-indane]-2,1′′(1H)-dione In the title compound, C31H23NO2S, the pyrrolidine ring adopts an envelope conformation (with the spiro C atom as the flap), while the thia­zolidine ring and the two cyclo­pentane rings adopt twisted conformations. The mean plane through the hexa­hydro­pyrrolo­[1,2-c]thia­zole ring [r.m.s deviation = 0.400 (1) Å] forms dihedral angles of 76.83 (4), 80.70 (5) and 79.00 (4)° with the benzene ring and the mean planes of the dihydro­acenaphthyl­ene and the dihydro­indene rings, respectively. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into sheets lying parallel to the bc plane. One of the ketone O atoms accepts three such bonds. Weak C—H⋯π inter­actions are also observed. Related literature For related structures, see: Wei et al. (2011a  ▶,b  ▶, 2012 ▶). For ring conformations, see: Cremer & Pople (1975 ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶). Experimental Crystal data C31H23NO2S M r = 473.56 Monoclinic, a = 8.4054 (1) Å b = 11.3716 (1) Å c = 23.5194 (2) Å β = 92.259 (1)° V = 2246.30 (4) Å3 Z = 4 Mo Kα radiation μ = 0.18 mm−1 T = 100 K 0.30 × 0.18 × 0.16 mm  Data collection Bruker SMART APEXII CCD diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2009 ▶) T min = 0.949, T max = 0.972 39597 measured reflections 10047 independent reflections 7694 reflections with I > 2σ(I) R int = 0.039  Refinement R[F 2 > 2σ(F 2)] = 0.051 wR(F 2) = 0.124 S = 1.03 10047 reflections 316 parameters H-atom parameters constrained Δρmax = 0.58 e Å−3 Δρmin = −0.29 e Å−3  Data collection: APEX2 (Bruker, 2009 ▶); cell refinement: SAINT (Bruker, 2009 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 ▶). Supplementary Material Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6700). supplementary crystallographic  information Comment As part of our ongoing search to prepare heterocyclic compounds with potential antitubercular activity (Wei et al., 2011a,b), we have synthesized the title compound as described below. In the molecular structure (Fig 1), the pyrrolidine ring (N1/C12/C13/C22/C23) is in envelope conformation (Cremer & Pople, 1975) [puckering parameters, Q= 0.4480 (11) Å and φ= 68.75 (14)° with atom C13 at the flap]. Meanwhile, the thiazolidine ring and the two cyclopentane rings (S1/N1/C23–C25, C1/C2/C10–C12 & C13–C15/C20/C21) are twisted about C25–S1 bond [puckering parameters, Q= 0.3450 (11) Å and φ= 339.37 (19)°], C12–C1 bond [puckering parameters, Q= 0.1209 (11) Å and φ= 167.0 (5)°] and C13–S14 bond [puckering parameters, Q= 0.2875 (11) Å and φ= 190.5 (2)°], respectively, adopting half-chair conformation. In addition, the dihedral angles between the mean plane through the hexahydropyrrolo [1,2-c]thiazole ring (S1/N1/C12/C13/C22–C25) [r.m.s deviation of 0.400 (1) Å] with the benzene ring (C26–C31) and the mean planes of the dihydroacenaphthylene and the dihydro-indene rings (C1–C10/C12 & C13–C21) are 76.83 (4), 80.70 (5) and 79.00 (4)°, respectively. The bond lengths and angles are within normal ranges and comparable to the related structure (Wei, et al., 2011b; Wei, et al., 2012). The crystal packing is shown in Fig. 2. The molecules are linked into sheets lying parallel to bc-plane via C7—H7A···O2, C4—H4A···O1, C23—H23A···O1 and C31—H31A···O1 (Table 1) hydrogen bonds. The crystal structure also features C18—H18A···Cg1 and C25—H25A···Cg2 (Table 1) interactions (Cg1 and Cg2 are the centroids of the C2–C6/C11 and C15–C20 rings, respectively). Experimental A mixture of (E)-(2-benzylidene)-2,3-dihydro-1H-indene-1-one (0.001 mol), acenaphthenequinone (0.001 mol) and thiazolidine-4-carboxylic acid (0.002 mol) (1:1:2) were dissolved in methanol (10 ml) and refluxed for 4 h. After completion of the reaction as evident from TLC, the excess solvent was evaporated slowly and the product was separated and recrystallized from methanol to reveal the title compound as yellow crystals. Refinement All H atoms were positioned geometrically (C–H = 0.95 and 1.00 Å) and refined using a riding model with Uiso(H) = 1.2 Ueq(C). Figures The molecular structure of the title compound, showing 30% probability displacement ellipsoids. The crystal packing of the title compound. The H atoms not involved in the intermolecular interactions (dashed lines) have been omitted for clarity. Crystal data Data collection Refinement Special details Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) Atomic displacement parameters (Å2) Geometric parameters (Å, º) Hydrogen-bond geometry (Å, º) Cg1 and Cg2 are the centroids of the C2–C6/C11 and C15–C20 rings, respectively. Symmetry codes: (i) −x+1, y−1/2, −z+1/2; (ii) −x+1, y+1/2, −z+1/2; (iii) −x+1, −y, −z; (iv) x−1, y, z; (v) x+1, y, z. References Hydrogen-bond geometry (Å, °) Cg1 and Cg2 are the centroids of the C2–C6/C11 and C15–C20 rings, respectively.
{"Chemical": ["dihydro\u00adindene", "Hydrogen", "cyclo\u00adpentane", "Mo", "Cg2", "methanol", "hexa\u00adhydro\u00adpyrrolo\u00ad[1,2-c]thia\u00adzole", "C31H23NO2S", "hexahydropyrrolo [1,2-c]thiazole", "thiazolidine", "pyrrolidine", "cyclopentane", "acenaphthenequinone", "dihydro-indene", "benzene", "Cg1", "(E)-(2-benzylidene)-2,3-dihydro-1H-indene-1-one", "thia\u00adzolidine", "ketone", "hydrogen", "thiazolidine-4-carboxylic acid", "dihydro\u00adacenaphthyl\u00adene", "dihydroacenaphthylene", "7\u2032-Phenyl-1\u2032,3\u2032,5\u2032,6\u2032,7\u2032,7a\u2019-hexa\u00adhydro\u00addipiro[acenaphthyl\u00adene-1,5\u2032-pyrrolo\u00ad[1,2-c]thia\u00adzole-6\u2032,2\u2032\u2032-indane]-2,1\u2032\u2032(1H)-dione"]}