Naphthyridinone derivatives for the treatment of a disease or disorder

A compound which is a phosphoric acid ester derivative of a compound of formula (I):

• or a pharmaceutically acceptable salt thereof, wherein
• L is (C1-C6) alkylene optionally substituted with one or more —OH;
• A is —OR2 or (C1-C6) alkyl optionally substituted with one or more substituents independently selected from —SO2(C1-C4)alkyl, —NHC(O)Rb, and —C(O)NHRc;
• R2 is (C1-C6) alkyl substituted with one or more substituents independently selected from —NHC(O)Rd and —C(O)NHRe, wherein the (C1-C6)alkyl is optionally further substituted with one or more substituents independently selected from halogen, —OH and —CN;
• Ra, Rb, Rc, Rd, and Re are each independently selected from H and (C1-C6) alkyl optionally substituted with one or more —OH;
• and
• R3 is (C1-C4)alkyl.