Compound represented by Formula (I) or a salt thereof, wherein R1 are the same or different, and each represents C1-C6 alkyl; X1 and X2 independently represent N or CH; Y is a group represented by Formula (A) in which the divalent moiety represented by is a C3-C10 heterocycloalkylene group containing nitrogen, a group represented by Formula (B) in which the divalent moiety represented by is a group C3-C10 cycloalkylene, or a group represented by Formula (C) in which the divalent moiety represented by is a C6-C12 arylene group; R2 is hydrogen, C2-C6 alkynyl, -C (>; = O) ORx, -C (>; = O) N (Rx) (Ry), hydroxy-C1-C6 alkyl, di (C1-C6 alkyl) amino-alkyl C1-C6, or C2-C9 heteroaryl optionally having R3; and R3 is C1-C6 alkyl or di (C1-C6 alkyl) amino-C1-C6 alkyl.Compuesto representado por la Fórmula (I) o una sal del mismo, en la que R1 son iguales o diferentes, y representan cada uno alquilo C1-C6; X1 y X2 representan independientemente N o CH; Y es un grupo representado por la Fórmula (A) en la que el resto divalente representado por es un grupo heterocicloalquileno C3-C10 que contiene nitrógeno, un grupo representado por la Fórmula (B) en la que el resto divalente representado por es un grupo cicloalquileno C3-C10, o un grupo representado por la Fórmula (C) en la que el resto divalente representado por es un grupo arileno C6-C12; R2 es hidrógeno, alquinilo C2-C6, -C(>;=O)ORx, -C(>;=O)N(Rx)(Ry), hidroxi-alquilo C1-C6, di(alquil C1-C6)amino-alquilo C1-C6, o heteroarilo C2-C9 que presenta opcionalmente R3; y R3 es alquilo C1-C6 o di(alquil C1-C6)amino-alquilo C1-C6.