Shandong FanTai Jinghua Biotechnology Co., Ltd--Formaldehyde; formalin|1,1-cyclopropanedimethanol|1,3-dibromopropane|1,3-cyclohexanedione|18-crown-6-ether|1-chloroethyl chloroformate

—— 1-methyl-4-piperidone ——