erably represents hydroxyl/or hydrogen, R10 represents hydrogen or a long chain hydrocarbyl group of at least 8 carbons, especially 8-24 or 50-3000 carbons, R12 represents hydrogen or alkyl of 1-6 carbons e.g. methyl or ethyl, R13 represents hydroxyl or hydrogen and R14 represents hydrogen or a amino, amido or imido group with a long chain aliphatic group or long chain mono or di acyl group, in pa