2933: Heterocyclc compd with nitrogen hetero atom(s) only; nucleic acids &

293311: Phenazone (antipyrin) and its derivatives 293319: Heterocyclic compds cntg an unfused pyrazole ring in the structure, n 293321: Hydantoin and its derivatives 293329: Heterocyclic compds cntg an unfused imidazole rg in the structure, ne 293331: Pyridine and its salts 293332: Piperidine And Its Salts 293339: Heterocyclic compds cntg an unfused pyridine ring in the structure, n 293340: Heterocyclic compds cntg quinolin/isoquinolin ring-syst, not furth fu 293351: Malonylurea (barbituric acid) and its derivatives; salts thereof 293359: Hetercycl compds cntg pyrimidin rng/piperazine rng, nes; nucleic acid 293361: Melamine 293369: Heterocyclic compds cntg an unfused triazine ring in the structure, n 293371: 6-hexanelactam (epsilon-captolactam) 293379: Lactams nes 293390: Heterocyclic compds with nitrogen hetero-atom(s) only, nes 2933: Heterocyclc compd with nitrogen hetero atom(s) only; nucleic acids &