| 摘要 |
<p>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.</p> |
