53760-19-3 AIDS-031241 AIDS031241 Acetic acid 16-benzyl-5,12-dihydroxy-5,7,14-trimethyl-13-methylene-18-oxo-17-aza-tricyclo[9.7.0.01,15]octadeca-3,9-dien-2-yl ester Cytochalasin H NSC305222