The absorption spectra of the adducts between 1,4-naphthoquinone and sulphydryl compounds such as thioglycolic acid, ethyl mercaptan, glutathione and the sulphydryl form of several proteins have been found to show maxima near 420m μ. 萘醌与巯基化合物如巯基乙酸、乙硫醇和谷胱甘肽等有当量加成关系。加合物在波长420mμ左右有一吸收峯。