ORGANIC CHEMISTRY Chapter 21 CH CH CHCH=C(CHCHCH2 CH)3CH CH Vitamine K1 The substance first indentified as essential for the normal clotting of blood OH OH 1, 4-Naphthoquinone Alizarin 茜素 A red pigment extracted from the roots of the madder plant Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 21 O O 1,4-Naphthoquinone O O CH3 CH2CH C(CH2CH2CH2CH)3CH3 CH3 CH3 Vitamine K1 The substance first indentified as essential for the normal clotting of blood O O OH OH Alizarin 茜素 A red pigment extracted from the roots of the madder plant