Two nonprotein amino acids, cycasindene and cycasthioamide, along with
eight known nonprotein amino acids, were isolated from the seeds of C
ycas revoluta Thunb. The Structures of cycasindene and cycasthioamide
were elucidated as 3-[3'-amino-indenyl-2']-alanine (1) and N-[glycinyl
-alaninyl-11-thio]-5-one-pipecolic acid (2) by chemical and spectral m
ethods. (C) 1997 Elsevier Science Ltd.