The present invention relates to a novel compound according to formula (I): and pharmaceutically acceptable salts thereof. For compounds of formula (I), R1 is H or -C(=O)-O-R3 and R2 is H or -C(=O)-O-R4, provided R1 and R2 are not both simultaneously H； R3 and R4 are independently selected from the group consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, arylalkyl, substituted arylalkyl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, heteroalkyl and substituted heteroalkyl. Pharmaceutical compositions of formula (I) and methods for the treatment of cancer are also provided.本發明係關於一種具有下式(I)之新穎化合物，及其醫藥上可接受之鹽類： 其中R1為H或-C(=O)-O-R3且R2為H或-C(=O)-O-R4，其條件為R1及R2不同時為氫；且R3及R4係獨立地選自由烷基、經取代之烷基、烯基、經取代之烯基、炔基、經取代之炔基、芳基、經取代之芳基、芳基烷基、經取代之芳基烷基、環烷基、經取代之環烷基、環雜烷基、經取代之環雜烷基、雜烷基及經取代之雜烷基組成之組群。本發明亦關於式(I)化合物之製備方法，及包含式(I)化合物之醫藥組成物，特別是用於治療癌症之醫藥組成物。
