معيار إرغوكالسيفيرول

 (3ß,5Z,7E,22E)-9,10-Secoergosta-5,7,10(19),22-tetraen-3-ol; (3S,5Z,7E,22E)-9,10-Secoergosta-5,7,10(19),22-tetraen-3-ol; 9,10-Secoergosta-5,7,10 (19),22-tetraen-3-ol, (3beta,5Z,7E,22E);   (1S,3Z)-3-[(2E)-2-[(1R,3aS,7aR)-1-[(E,2R,5R)-5,6-dimethylhept-3-en-2-yl]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-4-ylidene]ethylidene]-4-methylidenecyclohexan-1-ol;