Patent ID: 7166654

Claim:
An ester compound selected from the group consisting of methoxycarbonylmethyl dimethyl citrate, methoxycarbonylmethyl diethyl citrate, methoxycarbonylmethyl dibutyl citrate, ethoxycarbonylmethyl dimethyl citrate, ethoxycarbonylmethyl dibutyl citrate, ethoxycarbonylmethyl dioctyl citrate, butoxycarbonylmethyl dimethyl citrate, butoxycarbonylmethyl diethyl citrate, butoxycarbonylmethyl dibutyl citrate, dimethoxycarbonylmethyl monomethyl citrate, dimethoxycarbonylmethyl monoethyl citrate, dimethoxycarbonylmethyl monobutyl citrate, diethoxycarbonylmethyl monomethyl citrate, diethoxycarbonylmethyl monobutyl citrate, diethoxycarbonylmethyl monooctyl citrate, dibutoxycarbonylmethyl monomethyl citrate, dibutoxycarbonylmethyl monoethyl citrate, dibutoxycarbonylmethyl monobutyl citrate, and acetates thereof.