AIDS-132013 AIDS132013 Ethyl 2,7,7,12,12,17,17-heptamethyl-21,22,23,24-tetraoxapentacyclo[16.2.1.1~3,6~.1~8,11~.1~13,16~]tetracosa-1(20),3,5,8,10,13,15,18-octaene-2-carboxylate NSC625150