⊙第二节维生素B1(VitB) NH2 S CH2CH2OH- CI·HC CH2 CH3 Vit B Thiamine Hydrochloride⊙第二节 维生素B1 ( Vit B1 ) N CH3 N NH2 CH2 N S CH2CH2OH CH3 Cl - HCl Vit B1 Thiamine Hydrochloride