51212-98-7 6H-4,7-Methenofuro[3,2-c]oxacycloundecin-2,6(3H)-dione, 8-(acetyloxy)-11-[(acetyloxy)methyl]-3a,4,8,9,10,12a-hexahydro-3-methylene- AIDS-128858 AIDS128858 Melampodin B acetate NSC302035