Molecular Weight: 536.70, Molecular Formula: C30H48O8, Store at -20° C, BP: ~673.8° C at 760 mmHg, Synonym: Pla-B; (4R,7R,8S,9E,11S,12S)-8-(acetyloxy)-4,7-dihydroxy-12-[(1E,3E,5S)-6-[(2R,3R)-3-[(1R,2S)-2-hydroxy-1-methylbutyl]-2-oxiranyl]-1,5-dimethyl-1,3-oxacyclododec-9-en-2-one.