1.
Acta Crystallogr C
; 57(Pt 8): 965-7, 2001 Aug.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11498628
RESUMO
The title compound, 4-piperidiniocarboxylate (isonipecotic acid), crystallizes as a zwitterion and incorporates one water molecule, i.e. C(6)H(11)NO(2).H(2)O. The piperidine ring adopts a chair conformation and the alpha-carboxylate group is oriented in the equatorial position. The combination of the interactions between the alpha-amino and alpha-carboxylate groups and the water molecules builds a three-dimensional assembly of hydrogen bonds.
2.
Acta Crystallogr C
; 57(Pt 5): 638-40, 2001 May.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11353277
RESUMO
The crystal structure of the title compound, C30H48O3, a triterpene extracted from the resin of Protium crenatum Sandwith, is reported. The aliphatic acidic side chain is attached to the tirucallene four-ring system on its alpha-face and is extended by 7.248 (5) A in the 'left-hand' orientation.