five unusual amino acids were identified as antimutagens against spontaneous mutation of salmonella typhimurium ta100 : l-azetidine-2-carboxylic acid ( 1 ) from liliaceae plants , alpha- ( methylenecyclopropyl ) glycine ( 2 ) from litchi chinensis seeds , and 2-amino-4-methylhex-5-ynoic acid ( 3 ) , hypoglycin a ( 4 ) , and ( 2s,4r ) -2-amino-4-hydroxyhept-6-ynoic acid ( 5 ) from euphoria longana seeds .
C0017890
glycine
C0002520
amino