CH2(NH2)COOH+CH2(NH2)CH2COOH====
`
H2C-NH-CO
``│``````│
OC`````(CH2)2
``│``````│
``---------NH
真会给大家出难题.
点无意义,横竖代表共价键,左下角那拐了个弯.
把它拉圆点,成七元环.就OK 了
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