The molecule is a macrocycle isolated from a marine sediment-derived actinomycete, Streptomyces sp. A stereoisomer of marineosin A, it exhibits cytotoxicity against colon tumour cell lines. It has a role as a metabolite and an antineoplastic agent. It is an azaspiro compound, an ether, a macrocycle, an oxaspiro compound and a member of pyrroles.
(2S,2'S,3S,5'S,7'S)-3-methoxy-5'-methyl-5-(1H-pyrrol-2-yl)spiro[3,4-dihydropyrrole-2,3'-4-oxa-18-azatricyclo[13.2.1.02,7]octadeca-1(17),15-diene]