Stable crystals of pyrrole compound

Details Stable crystals of pyrrole compound Stable crystals of pyrrole compound

2007-05-01

2007-05-01

McKane, Joseph K. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

10471442

ABSTRACT:
The present invention is constituted with crystal of 2-amino-3-cyano-4-methyl-5-(2-fluorophenyl)pyrrole, which show diffraction peaks at diffraction angles (2θ±0.2 degree) of 10.3 degree, 14.3 degree, 15.5 degree, 15.9 degree, 25.1 degree and 25.7 degree in a powder X-ray diffraction spectrum, and also show absorption peaks at wavenumbers (cm−1, ±0.2%) of 3373, 3322, 2201, 762, 687 and 640 in an infrared absorption spectrum.The crystal of the present invention is superior in stability and is useful as a pharmaceutical bulk.

REFERENCES:
patent: 5998459 (1999-12-01), Tsuda et al.
patent: 6172102 (2001-01-01), Tsuda et al.
patent: 6353016 (2002-03-01), Tanaka et al.
patent: 0 842 923 (1998-05-01), None
Nicholas D. Cheronis, 1958, “Semimicro Experimental Organic Chemistry”, Chapter 5.
Brittain , H. G., polymorphism, in Pharmaceutical Solids, Drugs and the Pharmaceutical Science; 1999, V. 95, pp. 348-361.
Brittain , H. G., polymorphism in Pharmaceutical Solids, Drugs and the Pharmaceutical Science; 1999, V. 95, pp. 227-228, 252-256, and 275-276.

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