p. 3211 - 3214
(2007/10/02){[(8R,11R)-11-Amino-10-oxo-3,16-bis-(2,2,2-trifluoro-acetyl)-3,9,16-triaza-bicyclo[16.2.2]docosa-1(21),18(22),19-triene-8-carbonyl]-amino}-acetic acid pentafluorophenyl ester; compound with trifluoro-acetic acid
{[(8R,11R)-11-tert-Butoxycarbonylamino-10-oxo-3,16-bis-(2,2,2-trifluoro-acetyl)-3,9,16-triaza-bicyclo[16.2.2]docosa-1(21),18(22),19-triene-8-carbonyl]-amino}-acetic acid benzyl ester