33,34,49,50-Tetrathia-2,5,8,11,14,17,20,23,26,29,37,40,43,46-tetradecaazabicyclo[23.22.4]henpentacontane,cyclic peptide deriv.; Human big endothelin 2 (1-37); Human proendothelin-2(1-37)
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