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Polymorph (Ia) (m.p. 474 K) of the title compound, C12H18N2O3, displays an N—H...O=C hydrogen‐bonded layer structure which contains R66(28) rings connecting six molecules, as well as R22(8) rings linking two molecules. The 3‐connected hydrogen‐bonded net resulting from these interactions has the hcb topology. Form (Ib) (m.p. 471 K) displays N—H...O=C hydrogen‐bonded looped chains in which neighbouring...
Racemic dimetal tartrate hydrates were obtained from the reaction of d,l-tartaric acid with LiOH and MOH, where M=Li, Na, K, Rb, Cs, NH 4 . Dilithium trihydrate Li 2 (C 4 H 4 O 6 )·3H 2 O (1) consists of two distinct two-dimensional coordination networks [Li 6 (C 4 H 4 O 6 ) 3 (H 2 O) 9 ] n...
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