142632-32-4 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one, 11,12-d ihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-, [10R-[10.alpha.,11.beta.,12.alpha.]]- Calanolide A NSC650886