Patent ID: 7442833

Claim:
A compound of formula (I): including pharmacologically functional salts and solvates thereof, wherein R 1 is —C(O)-alkyl, —C(O)-aryl, —C(O)-heteroaryl, —C(O)-cycloalkyl, —C(O)—(CH 2 ) n —NR 4 R 5 , —C(O)—O-alkyl, —C(O)—(CH 2 ) n —O-alkyl, —C(O)—(CH 2 ) n -haloalkyl, —C(O)—(CH 2 ) n -heterocylcyl, or —PO 3 H 2 ; R 4 and R 5 each independently are selected from H and alkyl; and n is 1 to 6.