Meloside A is a phenylpropanoid extracted from barley. Meloside A exhibits antioxidant and protective properties against excess UV-B radiation and has been linked to resistance to pathogens.

Shancigusin I is a natural product from the tuber of Cremastra appendiculata.

L-Propargylglycine is an inhibitor of the enzyme.l-propargylglycine (LPG) irreversibly inhibited the enzyme from Crotalus adamanteus and Crotalus atrox in a dose- and time-dependent manner.?Inactivation was irreversible which was significantly protected by the substrate l-phenylalanine.?