Clerodane and 19-norclerodane diterpenoids from the tubers of Dioscorea antaly

From the EtOAc soluble part of the MeOH extract of the tubers of Dioscorea antaly, a yam endemic to Madagascar, two clerodanes, antadiosbulbins A and B, three19-norclerodanes, 8-epidiosbulbins E and G and the known diosbulbins E, were isolated together with nine known phenolics.