2918: Carboxylic acids (additional oxygen function), derivs

291811: Lactic acid, its salts & esters 291812: Tartaric acid 291813: Salts & esters of tartaric acid 291814: Citric acid 291815: Salts & esters of citric acid 291816: Gluconic acid, its salts & esters 291817: Phenylglycolic acid, its salts & esters 291819: Carboxylic acids (alcohol function only), derivatives 291821: Salicylic acid, salts 291822: O-acetylsalicylic acid, its salts & esters 291823: Salicylic acid esters, nes, salts 291829: Carboxylic acids (phenol function only) & derivatives 291830: Carboxylic acids (aldehyde, ketone function), derivs 291890: Carboxylic acids nes, derivativess 2918: Carboxylic acids (additional oxygen function), derivs