14908-00-0 25514-31-2 BRUCEIN A Bruceine A Isobruceine A NSC 310616 Picras-3-en-21-oic acid, 13,20-epoxy-3,11,12-trihydroxy-15-(3-methyl-1-oxobutoxy)-2,16-dioxo-, methyl ester, (11beta,12alpha,15beta)-