(S)-2,5-Bis(acetamido)valeriansaeure 39825-23-5 Bisorcic Bisorcic [INN] Bisorcico [INN-Spanish] Bisorcicum [INN-Latin] EINECS 254-644-4 N(sup 2),N(sup 5)-Diacetyl-L-ornithine N2,N5-Diacetyl_L-ornithine