Definition: A class of organic compounds containing a ring structure made up of more than one kind of atom, usually carbon plus another atom. The ring structure can be aromatic or nonaromatic.
GEN; prefer specifics; used for mapping supplementary chemicals
1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetraacetic acid [ 1,4,7,10-DOTA,1,4,7,10-tetraazacyclododecane--N,N',N'',N'''-tetraacetic acid,1,4,7,10-tetrakis(carboxymethyl)-1,4,7,10-tetraazacyclododecane,CuDOTA,DOTA acid ] structure given in first source