Crystals of N- (trans-4-isopropylcyclohexlycarbonyl)-D-phenylalanine and methods for preparing them

  • US 5,463,116 A
  • Filed: 02/02/1994
  • Issued: 10/31/1995
  • Est. Priority Date: 07/30/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. Crystals of N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine having at least one of the following properties:

  • (a) a melting point in the range of 136°

    -142°

    C.(b) a powder X-ray diffraction pattern with reflection maxima at 2θ

    of about 8.1°

    , 13.1°

    , 19.6° and

    19.9°

    ;

    (c) an infra red absorption spectrum with absorption bands in the region of 1714, 1649, 1542 and 1214 cm-1.

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