A. containing -COOC- can be hydrolyzed, and containing -OH and -COOH can lead to substitution and esterification, so a is correct;

B. If aromatic hydrocarbon only contains elements C and H, and rosmarinic acid does not belong to aromatic hydrocarbon, then B is wrong;

C. With benzene ring, C=C, 1mol rosmarinic acid can react with 7mol hydrogen at most, so c is correct;

D. The four phenols -OH, 1 -COOH, 1 -COOC- in rosmarinic acid all react with NaOH solution, so 1mol rosmarinic acid can react with 6mol? The aqueous solution of NaOH reacts completely, so D is wrong.

So choose AC.