1,2-Dihydro-4,4-dimethyl-4H-3,1-benzoxazin-2-thione 22796-64-1 4-27-00-02767 (Beilstein Handbook Reference) 4H-3,1-BENZOXAZIN-2-THIONE, 1,2-DIHYDRO-4,4-DIMETHYL- BRN 0140937