for the following products
(5Z,7E,22E)-9,10-seco-26,27-cyclo-1α,3β-dihydroxycholesta-5,7,10(19),22-tetren-24-one | Calcipotriene impurity A | Calcipotriol EP Impurity A and (1a,3b,5Z,7E,22E)-24-Cyclopropyl-1,3-dihydroxy-9,10-Secochola-5,7,10(19),22-tetraen-24-one