Diphenolic compounds and preparation methods thereof

A compound, which is represented by a formula (A),

• wherein W is
• and T is H,
• wherein R1 is selected from H, an optionally substituted alkyl group, and an optionally substituted arylalkyl group;
• R2 and R6 are the same or different, which are independently selected from an optionally substituted aryl group, an optionally substituted heteroaryl group, the optionally substituted alkyl group, an optionally substituted amide group, and an optionally substituted ester group;
• R3, R4, R7, and R8 are the same or different, which are independently selected from H, the optionally substituted alkyl group, an optionally substituted cycloalkyl group, and the optionally substituted amide group, wherein R3, R4, and a carbon atom to which R3 and R4 are both connected are connected to form a ring, R7, R8, and a carbon atom to which R7 and R8 are commonly linked are connected to form a ring, wherein the optionally substituted amide group includes at least one of —NHCOCH3, —NHCOH, —NHCOCH2CH3, —NHCOCH2CH2CH3, —NHCOCH(CH3)2, —NHCOCH(CH2)2, —N(COCH3)2, —CONH2, —CON(CH3)2, —CONHCH3, —CONHCH2CH3, —CON(CH2CH3)2, —CONHCH(CH3)2, —CONHCH2CH2CH3, —CONHCH2CH2CH2CH3, a phthalimido group, a succinimidyl group, a glutarimido group, a maleimido group,
• wherein R9 is selected from the optionally substituted alkyl group, the optionally substituted aryl group, a carboxyl or a salt thereof, a cyano group, the optionally substituted amide group, and the optionally substituted ester group, n is a natural number from 1 to 6, the optionally substituted ester group is —COOCH3, —COOCH2CH3, —COOCH(CH3)2, —COOCH2CH2CH3, or —COOCH2CH2CH2CH3;
• or a cosmetically acceptable salt thereof or a pharmaceutically acceptable salt thereof, stereoisomers or mixtures of the stereoisomers, enantiomers or mixtures of the enantiomers, or racemic mixtures.