83209-65-8 Cyclic(L-alanyl-D-alanyl-eta-oxo-L-alpha-aminooxiraneoctanoyl-D-prolyl) Cyclo(2-amino-8-oxo-9,10-epoxydecanoic acid-prolyl-alanyl-alanine) Cyclo(L-alanyl-D-alanyl-(alphaS,2S)-alpha-amino-eta-oxooxiraneoctanoyl-D-prolyl) Cyclo(aoe-pro-ala-ala) HC Toxin HC-Toxin