by deuterium-labelling and analysis of the products by gas chromatography-selected ion monitoring it was shown that 2beta-hydroxylation of ga1 to ga8 and 3beta-hydroxylation of ga20 to ga1 occur with retention of configuration and that the conversion of ga20 to ga5 occurs with loss of the 2beta- and 3beta-hydrogens .
C0011744
deuterium
C0020275
hydrogens