238000002360 preparation method Methods 0.000 title claims abstract description 22.238000000034 method Methods 0.000 title claims abstract description 49.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US67286196A priority Critical Priority to US08/672,861 priority Application filed by Schering Corporation filed Critical Schering Corporation Publication of WO1998000437A1 publication Critical patent/WO1998000437A1/en Links Tsai Chou-Hong Tann Xiaoyong Fu Original Assignee Schering Corporation Priority date (The priority date is an assumption and is not a legal conclusion. Google Patents WO1998000437A1 - PROCESS FOR THE PREPARATION OF 17-ESTERS OF 9α,21-DIHALO-PREGNANE-11β,17αDIOL-20-ONES
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