| abstract |
A novel compound with anthraquinone structure and having the following foluma (I):wherein R1, R2 and R3 each independently is hydrogen, hydroxy, amino or C1-6 alkyl group; R4 is hydrogen, C1-18 alkyl carbonyl, C1-6 alkyl group substituted by at least a functional group; R5 is hydrogen amino or a group of the following formulawherein R1, R2, R3 and R4 are defined as the above; and R and R' each independently is hydrogen, hydroxyl, amino, C1-6 alkyl group or a group of the following formulawherein R1, R2, R3 and R4 are defined as the above. |