79859-42-0 AIDS-013389 AIDS013389 NSC639447 Trichorabdal B [(3R,4a'R,5'S,7'R,9a'R)-2-Formyl-5'-hydroxy-3-methyl-8'-methylene-1',9'-dioxohexahydrospiro[cyclohexane-1,4'-[2]oxa[7,9a]methanocyclohepta[c]pyran]-3-yl]methyl acetate