AIDS-135237 AIDS135237 Isoteuflin NSC634629 Spiro[furan-3(2H),6'-[6H]naphtho[1,8-bc]furan]-2,2'(4'H)-dione, 5-(3-furanyl)-2'a,3',4,5,5',7',8',8'a-octahydro-7'-methyl-