158792-23-5 Benzoic acid, 2-hydroxy-4-((4-hydroxy-2-methoxy-3,5,6-trimethylbenzoyl)oxy)-3,5,6-trimethyl-, 4-carboxy-3-methoxy-2,5,6-trimethylphenyl ester Benzoic acid, 2-hydroxy-4-((4-hydroxy-2-methoxy-3,5,6-trimethylbenzoyl)oxy)-3,5,6-trimethyl-,4-carboxy-3-methoxy-2,5,6-trimethylphenyl ester PS 990 PS-990