opsin
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1,2-Diaminopropane-N,N,N',N'-tetraacetic acid
Original report by Alex Clark (Bitbucket: aclarkxyz, GitHub: aclarkxyz).
OC1=O.OC2=O.OC3=O.OC4=O.N56C7CN8C4.C7.C15.C26.C38