1-Oxaspiro(2.5)octan-6-ol, 4-(1,5-dimethyl-1,2-epoxy-4-hexenyl)-5-methoxy- 4-(1,5-Dimethyl-1,2-epoxy-4-hexenyl)-5-methoxy-1-oxaspiro(2.5)octan-6-ol Fumagillin dihydroalcohol-I RP3680300