0615.27 17a(H)-22,29,30-Trisnorhopane [53584-59-1] 0622.27 aaa20R-Cholestane [481-21-0] 0662.29 aßß20R 24R-Ethylcholestane [99664-78-5] 0609.29 aaa20R 24R-Ethylcholestane [62446-14-4]