The molecule is a macrolide consisting resulting from the formal lactonisation of the carboxy group of (2E,4E,6R,7S,8S,10E,12E,14S,15R,16S,17R,18S)-18-[(2R,4R,5S,6R)-4-{[(2E)-3-carboxyprop-2-enoyl]oxy}-2-hydroxy-5,6-dimethyltetrahydro-2H-pyran-2-yl]-7,15,17-trihydroxy-14-methoxy-2,4,6,8,10,16-hexamethylnonadeca-2,4,10,12-tetraenoic acid with the hydroxy group at position 15. It is active against SV40 tumour cells, and inhibits the growth of solid tumour-derived cell lines such as DLD-1 human colon cancer cells with increased cells in G1 and S phases. It has a role as an antimicrobial agent, an antineoplastic agent and a bacterial metabolite. It is a macrolide, a cyclic hemiketal, a member of oxanes, a secondary alcohol, an enoate ester, an alpha,beta-unsaturated monocarboxylic acid and an ether.
(E)-4-[(2R,4R,5S,6R)-2-hydroxy-2-[(2S,3R,4S)-3-hydroxy-4-[(2R,3S,4E,6E,9S,10S,11R,12E,14E)-10-hydroxy-3-methoxy-7,9,11,13,15-pentamethyl-16-oxo-1-oxacyclohexadeca-4,6,12,14-tetraen-2-yl]pentan-2-yl]-5,6-dimethyloxan-4-yl]oxy-4-oxobut-2-enoic acid