L-methionyl-L-aspartyl-2-amino-2-methylpropionamide hydrochloride   、                                                                                      
N-t-butoxycarbonyl-L-tryptophanyl-L-methionyl-L-aspartyl-D-alanine amide                                                                                                                                                                                              以
                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                                                        以there is obtained N-t-butoxycarbonyl-L-tryptophanyl-L-methionyl-L-aspartyl-2-amino-2-methylpropionamide containing 1/3 mole of water of hydration per mole的产率得到N-t-butoxycarbonyl-L-tryptophanyl-L-methionyl-L-aspartyl-2-amino-2-methylpropionamide