三氟乙酸 、
(6S,8aS)-4-Oxo-2-phenylmethanesulfonyl-octahydro-pyrrolo[1,2-a]pyrazine-6-carboxylic acid [(S)-1-[4-(4-methoxy-2,3,6-trimethyl-benzenesulfonylamino)-cyclohexyl]-2-(1-methyl-1H-tetrazol-5-yl)-2-oxo-ethyl]-amide 在
甲烷磺酸 、
茴香硫醚 作用下,
以73%的产率得到(6S,8aS)-4-Oxo-2-phenylmethanesulfonyl-octahydro-pyrrolo[1,2-a]pyrazine-6-carboxylic acid [(S)-1-(4-amino-cyclohexyl)-2-(1-methyl-1H-tetrazol-5-yl)-2-oxo-ethyl]-amide; compound with trifluoro-acetic acid