2-Thiazolidinone, 4-(15-hydroxy-5,10-dimethyl-3-oxo-2,14-dioxabicyclo(11.3.1)heptadeca-4,8-dien-15-yl)-, (1R*,4Z,8Z,10S*,13R*,15R*(R*))-(+)- 76343-94-7 LAT-B Latrunculin B NSC 339663