抄録
It was reported in the previous paper that a new compound "Bisteroid" was produced by the reaction of vitamin D with SbCl_3 reagent containing acetyl chloride and that the assumed structure contained a furan ring. However, the author found in recent investigations that the assumed structure had to be corrected in the following : (1) The "Bisteroid" reported in previous paper is a mixture of two componennts (crystalline A and B). (2) The crystalline A is a compound having the molecular formula C_<54>H_<84> and the crystalline B is a monoacetate having the molecular formula C_<56>H_<88>O_2. Both dimers originate from the condensation of 2 moles of vitamin D.
