The present invention relates to stable crystalline (6S)—N(5)-formyl-5,6,7,8-tetrahydrofolic acid, commonly referred to as levofolinic acid, in essentially pure 6S diastereomeric form, and to a process for its preparation.
本发明涉及稳定的晶体(6S)-N(5)-甲酰基-
5,6,7,8-四氢叶酸,通常称为左旋叶酸酯,其本质上为纯6S对映体形式,以及其制备方法。