摘要 |
Compounds of formula II wherein each R<SUP>1 </SUP>and R<SUP>2 </SUP>is independently selected from H and -P(O)(R<SUP>3</SUP>)(R<SUP>4</SUP>), provided that at least one of R<SUP>1 </SUP>and R<SUP>2 </SUP>is -P(O)(R<SUP>3</SUP>)(R<SUP>4</SUP>); each R<SUP>3 </SUP>and R<SUP>4 </SUP>is independently selected from the group consisting of H, -OH, C<SUB>1</SUB>-C<SUB>6 </SUB>alkyl and C<SUB>1</SUB>-C<SUB>6 </SUB>alkoxy; or a pharmaceutically acceptable salt thereof. Pharmaceutical compositions comprising a compound of formula II, and methods of administering such compounds and compositions.
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