Synonyms: 9,10-Secoergosta-5,7,10(19)-trien-3-ol,(3b,5Z,7E)- (9CI);Ergocalciferol,22,23-dihydro- (6CI);Vitamin D4 (7CI,8CI);22,23-Dihydroercalciol;22,23-Dihydroergocalciferol;22,23-Dihydrovitamin D2;24S-Methylcalciol;(3b,5Z,7E)-9,10-Secoergosta-5,7,10(19)-trien-3-ol;(3b,5Z,7E)-9,10-Secoergosta-5,7,10(19)-trien-3-ol;(3S,5Z,7E)-9,10-Secoergosta-5,7,10-trien-3-ol;(5Z,7E)-(3S)-9,10-seco-5,7,10(19)-campestatrien-3-ol;22:23-Dihydrovitamin D2;