CH3 N SNa CH2CH2OH CH3 环合 CH3 CH2CH2OH CH3 2H CH3 CH2CH2OH 硫色素 CH3 ThiochtomeN CH3 N N N S CH2CH2OH CH3 H 环合 N CH3 N N N S CH2CH2OH CH3 Na N CH3 N N N S CH2CH2OH CH3 [O]－2H 硫色素 Thiochtome