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Ca-19 【以下参考図】
A 及びA'は ethylenediaminetetraacetic acid molecule chilating with calcium ion.
B 及びB'は disodium ethylenediaminetetraacetic acid molecule chilating with calcium ion.
KEYS. White(large): Calcium, white(small): hydrogen, red: oxygen, blue: nitrogen, black: carbone, yellow: sodium.
http://homepage2.nifty.com/cryomedicine/wdD_I.htm より引用。