Compositions comprising a naphtho [1,2-b]pyran of formula (I):
wherein R7 and/or R9 is hydrogen or an amino group provided that R7 and R9 are not both hydrogen, and the other substituents are as defined in the specifcation.
该公式为(I)的
萘并[1,2-b]
吡喃的组合物:
其中R7和/或R9是氢或
氨基,但R7和R9不能同时为氢,其他取代基如规范中定义。