1,24,25-Trihydroxyergocalciferol

**Semantic type:** Vitamin

**Definition:** A biologically inactive vitamin D derivative that is produced by the hydroxylation of 1,25-dihydroxyvitamin D2 presumably by 1,25-dihydroxyvitamin D3 24-hydroxylase (CYP24A1). 1,24,25-trihydroxyergocalciferol may be a marker for the metabolism of dietary ergocalciferol.

**Synonyms:** - (1alpha,3beta,5Z,7E,22E)-9,10-Secoergosta-5,7,10(19),22-Tetraene-1,3,24,25-Tetrol - 1,24,25(OH)3 D2 - 1,24,25-Trihydroxyvitamin D2 - 9,10-Secoergosta-5,7,10(19),22-Tetraene-1,3,24,25-Tetrol, (1alpha,3beta,5Z,7E,22E)-