3,5-ditert-butyl-N-methoxy-4-oxocyclohexa-2,5-dien-1-imine oxide

3,5-ditert-butyl-N-ethoxy-4-oxocyclohexa-2,5-dien-1-imine oxide

PChd-Phe-OMe

2,6-二叔丁基苯酚

PChd-L-Pro-L-Leu-Gly-NH2