106463-75-6 424828-97-7 Amphidinolide A Oxacycloeicosa-3,5,14-trien-2-one, 9,10,12,13-tetrahydroxy-4,19-dimethyl-20-((2R,3S)-3-((1S)-1-methylbutyl)oxiranyl)-8,11,17-tris(methylene)-, (3E,5E,9S,10S,12S,13S,14E,19S,20R)-