Compounds of formula (I); wherein R1 is H or NHZ; R2 is optionally substituted aryl or heteroaryl attached via a carbon atom; R3 is H; optionally substituted C1-C6alkyl, C2-C6alkenyl, C2-C6alkynyl, or C3 C7 cycloalkyl, halogen; OH or OR, or R4 is H, optionally substituted C1-C6alkyl, C3 C6alkenyl, C3-C6alkynyl, C3-C7 cycloalkyl, aryl or heteroaryl, R5 is H or optionally substituted C1-C6alkyl, C3-C6alkenyl, C3-C6alkynyl, or C3-C7 cycloalkyl; or R4 and R5 together form a 5 or 6-membered heterocyclic ring; and R10 is optionally substituted C1-C6alkyl; are purine receptor, particularly adenosine receptor antagonists, useful for treatment of, inter alia, movement disorders such as Parkinsons disease.