A compound having formula (I), wherein G1 represents a C4-C22 alkyl or alkenyl group, a C8-C20 aralkyl group or formula (II) wherein G3 is a difunctional C2-C18 alkyl or alkenyl group, a difunctional C6-C20 aryl group or G3 is absent; provided that G1 is not 2-butyl, n-hexyl, n-octyl, n-dodecyl, n-hexadecyl or 2- phenylethyl.
具有
化学式(I)的化合物,其中G1代表C4-C22烷基或烯基基团,C8-C20芳基烷基基团或
化学式(II)中的G3是双官能团C2-C18烷基或烯基基团,双官能团C6-C20芳基基团或G3不存在;但G1不是2-丁基、正己基、
正辛基、正十二基、正十六基或2-苯乙基。