25mg. (11aR)-3,7-Bis(4-chlorophenyl)-10,11,12,13-tetrahydro-10,10,13,13-tetramethyl-5-hydroxy-diindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocin, 98%. . Molecular Weight: 591.5. Molecular Formula: C33H29Cl2O4P. Color/form: off white to light yellow pwdr. Strem# 15-8575. http://www.strem.com/catalog/v/15-8575/