Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of Molecular Structure called Molecular structure of the unusual complex of 1-piperidineacetic acid with 2,4,6-trinitrophenol studied by X-ray, FTIR and 1H, 13C and 13C CP MAS NMR, Author is Dega-Szafran, Z.; Dutkiewicz, G.; Kosturkiewicz, Z.; Petryna, M., which mentions a compound: 3235-67-4, SMILESS is OC(=O)CN1CCCCC1, Molecular C7H13NO2, Recommanded Product: 3235-67-4.
Crystals containing three kinds of mols. 1-piperidiniumacetate (II), 1-piperidiniumacetic acid (III) and 2,4,6-trinitrophenolate (picrate, TNP-), belong to the monoclinic system, space group P21/c and Z=4, a=12.831(3), b=26.093(5), c=7.157(1) Å, β=101.18(3)°, R=0.0758. The zwitterion mol. (II) is a double acceptor of protons from two mols. of 1-piperidiniumacetic acid (III) (N-H···O, 2.735(5) Å and O-H···O, 2.472(5) Å), and a donor of proton to the picrate mol. (N-H···O, 2.747(5) Å). These three mols., which have three donor centers and several acceptor groups, form hydrogen-bonded chains parallel to the z axis. The oxygen atoms inactive in these hydrogen bonds, are engaged in the C-H···O short contacts, which can be treated as weak hydrogen bonds, and join the chains into a three-dimensional network. The presence of protonated 1-piperidineacetic acid (III) and its zwitterion (II) in the crystal has been confirmed by 13C CP MAS NMR and solid state FTIR spectra.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem