| 摘要 |
<p>Crystals of 2-Ä(2-amino-1,6-dihydro-6-oxo-9H-purine-9-yl)methoxyÜethyl N-Ä(benzyloxy)carbonylÜ-L-valinate, having peaks at angles of diffraction of at least 15.3 DEG , 21.3 DEG , 23.8 DEG and 27.2 DEG (2&thetas;, CuK alpha rays) in the diffraction X-ray in the determination by the powder X-ray diffraction method, are provided. These catalysts are substantially not hygroscopic and have a high purity and a low impurity content and, therefore, useful as intermediates for Valaciclovir used as an antiviral drug.</p> |
