Diisopropyl {[(R)-2-(2-amino-6-chloro-9H-purin-9-yl)-1-methylethoxy]methyl}phosphonate

In the title compound, C15H25ClN5O4P, the r.m.s. deviation for the purine ring system is 0.0165 . The coordination about the P atom is a distorted tetrahedron [O=P—O angles = 116.70 (6) and 109.87 (6)°]. In the crystal, molecules are linked by N—H...O hydrogen bonds, generating a three-dimensional network.