[Met5,Arg6,Gly7,Leu8] Enkephalin

cis-4-Hydroxy-D-proline belongs to the class of organic compounds known as proline and derivatives. Proline and derivatives are compounds containing proline or a derivative thereof resulting from a reaction of proline at the amino group or the carboxyl group or from the replacement of any hydrogen of glycine by a heteroatom.

Hellebrigenol shows cytotoxicity against HepG2 cells.