发明授权
US2499257A 2 - methyl - 7 - hydroxy - tetrahydrophenanthrene - carboxylic acid derivatives and the production thereof 失效
2-甲基-7-羟基 - 四氢菲 - 羧酸衍生物及其制备

2 - methyl - 7 - hydroxy - tetrahydrophenanthrene - carboxylic acid derivatives and the production thereof
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