4,6-bis(4-dodecylbenzoyl)benzene-1,3-dicarboxylic acid;2,5-bis(4-dodecylbenzoyl)terephthalic acid;4,6-bis(4-hexylbenzoyl)benzene-1,3-dicarboxylic acid;2,5-bis(4-hexylbenzoyl)terephthalic acid;4,6-bis(4-nonylbenzoyl)benzene-1,3-dicarboxylic acid;2,5-bis(4-nonylbenzoyl)terephthalic acid;4-(4-butan-2-ylbenzoyl)-6-(4-methylbenzoyl)benzene-1,3-dicarboxylic acid