(R)-2-amino-3-benzylsulfanyl-N-(2-dimethylaminoethyl)propionamide trifluoroacetic acid salt   、                                                                                      
4-甲基-1-萘磺酰氯                                                                                                                                                                                                                                                                                                          以to obtain 101 mg (50% yield) of the title compound in pure form的产率得到(R)-4-methylnaphthalene-1-sulfonic acid [2-benzylsulfanyl-1-(2-dimethylaminoethylcarbamoyl)ethyl]amide