B. Bhat et al., THE BIOSYNTHESIS OF THE MOLD METABOLITES ROQUEFORTINE AND ASZONALENINFROM L-[2,4,5,6,7-H-5(2)] TRYPTOPHAN, Tetrahedron, 49(46), 1993, pp. 10663-10668
L-[2,4,5,6,7-H-2(5)]Tryptophan was incorporated into roquefortine 2 by
Penicillium roqueforti and aszonalenin 3 by Aspergillus zonatus with
retention in each case of five deuterium atoms; the 5a-hydrogen of bot
h metabolites is derived from the 2-hydrogen of tryptophan.