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Isethionate salt of a selective CDK4 inhibitor

  • US 7,863,278 B2
  • Filed: 09/26/2007
  • Issued: 01/04/2011
  • Est. Priority Date: 07/11/2003
  • Status: Active Grant
First Claim
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1. An isethionate salt of 6-acetyl-8-cyclopentyl-5-methyl-2-(5-piperazin-1-yl-pyridin-2-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one comprising a mono-isethionate salt of Form A, characterized by one or more of the following:

  • a powder X-ray diffraction pattern having peaks at 2θ

    values of about 8.7, 13.5, and 17.6, or a Raman spectrum having peaks at Raman Shift values of about 1600 cm

    1
    , 1290 cm

    1
    , 675 cm

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    , 470 cm

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    , 450 cm

    1
    , and 425 cm

    1
    , or a DSC thermogram having a sharp endotherm at about 273°

    C.

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