Rosmarinic acid has the effects of antioxidation, delaying aging, reducing weight and lipid, etc. Its structural formula is as follows: the route of synthesizing rosmarinic acid from catechol is as follows a. C atoms with four different groups are chiral carbon atoms, and those circled are chiral carbon atoms, so A is correct;

B. The benzene ring has a planar structure, and the atoms directly connected with the benzene ring must be in the same plane, and the H on -OH is not necessarily in the same plane, so B is wrong;

C. Organic substance C is hydrolyzed under the catalysis of dilute sulfuric acid, and only the ester group is broken, and the hydrolysate is , and there is no substance B, so C is wrong;

phenol -OH and -COOH in p>D．B are acidic, so 1 mol of b contains 2mol of phenol -OH and 1 mol of-cooh, which can consume up to 3? MolNaOH, so d is correct;

so choose ad.