2-[6-((2E,4E,10E)(6S,7S,9S,8R)-7,9-Dimethoxy-3,6,8-trimethyl-11-phenylundeca-2,4,10-trienoylamino)(2Z,5Z)hexa-2,5-dienoylamino]acetic acid AIDS-108092 AIDS108092 Crocacin B