The present invention relates to a compound of formula III, wherein, R is selected from the group consisting of C1-C4 alkyl, substituted or unsubstituted phenyl, and substituted or unsubstituted benzyl, preferably isopropyl; and two Ar groups may be the same or different, and are each independently selected from the group consisting of substituted or unsubstituted aryl groups, preferably substituted or unsubstituted phenyl, such as p-methoxyphenyl and the like, wherein the compound is preferably in a solid form.
本发明涉及一种式 III 的化合物,其中,R 选自 C1-C4 烷基、取代或未取代
苯基、取代或未取代
苄基组成的组,优选
异丙基;两个 Ar 基团可以相同或不同,且各自独立地选自取代或未取代芳基组成的组,优选取代或未取代
苯基,如对
甲氧基苯基等,其中化合物优选为固体形式。