10-Hydroxy-epi-21-O-methylkribine 18-Noradifoline, 3,4,5,6,16,17-hexahydro-5-decarboxy-16-de(methoxycarbonyl)-21-deoxy-19,20-didehydro-4,21-dimethyl-17-methoxy-, (3-alpha,17-alpha)- RB4600000