ONH(S)NHNONH(S)NHONH(S)HOONH(S)OHONH(R)OHONH(S)CH3CH3ONH(S)OONH(S)NHNHNH2ON(R)NH-NHNHNHTrpSerTyrD-SerLeuArgProHONHOHisNH2ONH2O