10-(Iodomethyl)-1,4,9-trioxadispiro[4.0.5.4]pentadec-13-en-8-one AIDS-160221 AIDS160221 NEOLIGNAN-MEGAPHONE INTERMEDIATE PAZ-NIH-5-CA NEOLIGNAN-MEGAPHONE INTERMEDIATE PAZ-NIH-6-CA NSC364551 NSC364953