摘要:
A quinone derivative of the formula (I): in which A is a group of the formula: (IV): or a group of the formula (V): in which X and Y are either the same as or different from each other and each are hydroxy, methoxy or hydrogen; and n is an integer of 1 to 5, and methods of preparing such derivative are disclosed. The compounds exhibit useful pharmacological properties which make them useful in pharmaceutical compositions.