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2. Y-Conjugated compounds: the equilibrium geometries and electronic structures of guanidine, guanidinium cation, urea, and 1,1-diaminoethylene
3. 671. Nitramines and nitramides. Part V. Nitrations of urethane, N-methylurethane, urea, and hexahydro-1 : 3-dinitro-1 : 3 : 5-triazine in sulphuric acid