2-[(R)-2-[[(S)-2-[2-(6-amidino-1-ethylindol-2-yl)ethyl]pyrrolidinyl]carbonyl]pyrrolidinyl]-4-hydroxybutanoic acid                                                                                                                                                              在
                                                                                                                                                                                 
甲醇乙酸乙酯   、                                                                                                  silica                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
盐酸                                                                                  为溶剂,
                                                                                                                                                    反应 18.0h,
                                                                                                                以ethyl acetate/methanol(3:1) on NH-DM1020 silica to obtain 70 mg of the title compound as a white solid的产率得到1-ethyl-2-[2-[(S)-1-[[(R)-1-(2-oxo-3-oxolanyl)pyrrolidin-2-yl]carbonyl]pyrrolidin-2-yl]ethyl]indole-6-carboxamidine