O O—CcH 2 CH2C-O. ● NCH, CH2N O—CCH CHC-O: EDTA 乙二胺四乙酸根 Ethylenediamine tetraacetic acid Chelate 螯合物 COED TATEDTA 乙二胺四乙酸根 Ethylenediamine tetraacetic acid Chelate 螯合物