Помогите составить формулы трипептида ГЛИ-АЛА-СЕР.

Скорее всего, должно быть так:                            O    H             O   H               O                        ||     |               ||     |                || H2N – CH2 – C – N – CH – C – N – CH – C – OH                                     |                      |                                    CH3                CH2                                                            |                                                           SH