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3, 6-BIS (chloromethyl)durene is a biochemical reagent[1].

Crystallise it three times from *C6H6 (m 193-194o) or pet ether (m 195-196o), then dry it in vacuo in a drying pistol. [Fuson et al. J Am Chem Soc 75 5952 1953, Beilstein 5 IV 1140.]

[1] Hydroxysteroid (17beta) dehydrogenase 7 activity is essential for fetal de novo cholesterol synthesis and for neuroectodermal survival and cardiovascular differentiation in early mouse embryos
[2] Transcriptional regulation of human and murine 17beta-hydroxysteroid dehydrogenase type-7 confers its participation in cholesterol biosynthesis
[3] Methods of biochemical analysis[M]. John Wiley & Sons, 2009.