1,5-(Epoxymethano)cyclopenta[c]pyran-3-carboxamide, 1,4a,5,7a-tetrahydro-5-hydroxy-8-oxo-, (1S,4aR,5S,7aS)- 79127-35-8 AIDS-010681 AIDS010681 Echinosporin NSC357683 XK 213