ertacalciol
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tachysterol — Sterol(s) formed by ultraviolet irradiation of any 5,7 diene 3β sterol, which breaks the 9,10 bond, but usually from either or both of ergosterol and lumisterol to produce t.2 (ertacalciol, (6E,22E) 9,10 secoergosta 5(10),6,8,22 tetraen 3β ol)… … Medical dictionary
