A compound represented by the following formula I, a stereoisomer thereof, or a pharmaceutically acceptable salt thereof: wherein R 1 is hydrogen or -CH 3, R 2 is hydrogen or -CH 3, provided that R 2 is -CH 3 when R 1 is hydrogen, and R 2 is hydrogen when R 1 is -CH 3 L is -(C 4 -C 5 alkyl)-; -(C 1 -C 3 alkyl)-L 1 -; -C(=O)-L 1 - or -S(=O) 2 -L 1 -, wherein -(C 4 -C 5 alkyl)- and -(C 1 -C 3 alkyl)- may be unsubstituted or substituted with-CH 3, L 1 is -(C 3 -C 6)cycloalkyl-; A 1 and A 2 are each independently -N- or -CR 3 -, provided that both A 1 and A 2 cannot be -N-, R 3 is hydrogen; -F, -Cl, -Br, -I or -OH, and A 3 is -NH- or -O-, Q is selected from the group consisting of -(C 1 -C 6)alkyl-; -(C 2 -C 6)alkenyl-; -C(=O)-;-C(=S)-; -S(=O) 2 - or wherein -(C 1 -C 6)alkyl- and -(C 2 -C 6)alkenyl- may be unsubstituted or each independently substituted 1 to 3 -CH 3 groups or halogen atoms, Q 1 is hydrogen; -F, -Cl, -Br or -I, n is an integer of 0, 1 or 2, provided that n is 0 when Q is n is 1 when Q is -C(=O)-; -C(=S)- or -S(=O) 2 -, and n is 1 or 2 when Q is -(C 1 -C 6)alkyl- or -(C 2 -C 6)alkenyl-, and X may be selected from the group consisting of -C 1 -C 6 alkyl; -C 3 -C 6 cycloalkyl; -C 2 -C 6 alkenyl; -C 3 -C 6 cycloalkenyl; -(C 0 -C 2 alkyl)Ar; -OAr; -(C 0 -C 2 alkyl)Het; naphthyl and following groups: wherein R 4 is H or -C 1 -C 4 alkyl, -C 0 -C 2 alkyl, -C 2 -C 6 alkenyl and -C 1 -C 6 alkyl may be unsubstituted or substituted with 1 to 2 -CH 3 groups; 1 to 3 -F groups, or a combination thereof, Ar is a C 6 monocyclic aromatic compound, which may be unsubstituted or substituted with one or more halogen atoms; -OH; -NH 2; -C 1 -C 6 alkyl; -O(C 1 -C 6)alkyl; -C 3 -C 6 cycloalkenyl; -NH(C 1 -C 6 alkyl); -N(C 1 -C 3 alkyl) 2; -CH 2 N(C 1 -C 3 alkyl) 2; -S(=O) 2 -(C 1 -C 3 alkyl) or phenyl groups, wherein -C 1 -C 3 alkyl; -C 1 -C 6 alkyl and -C 3 -C 6 cycloalkenyl may be each independently substituted with 1 to 5 -F or -CH 3 groups, and Het is a 4- to 6-membered heteroaromatic or non-aromatic ring compound containing 1 to 3 elements selected from the group consisting of N, O and S while having 0 to 3 double bonds, and may be unsubstituted or substituted with one or more halogen atoms; -C 1 -C 6 alkyl; -C(=O)(C 1 -C 3 alkyl); -S(=O) 2 (C 1 -C 3 alkyl) or benzyl groups, wherein -C 1 -C 3 alkyl and -C 1 -C 6 alkyl may be each independently substituted with - OH; 1 to 5 -F or -CH 3 groups. R 1 is hydrogen or -CH 3, R 2 is hydrogen or -CH 3, provided that R 2 is -CH 3 when R 1 is hydrogen, and R 2 is hydrogen when R 1 is -CH 3 L is -(C 4 -C 5 alkyl)-; -(C 1 -C 3 alkyl)-L 1 -; -C(=O)-L 1 - or -S(=O) 2 -L 1 -, wherein -(C 4 -C 5 alkyl)- and -(C 1 -C 3 alkyl)- may be unsubstituted or substituted with-CH 3, L 1 is -(C 3 -C 6)cycloalkyl-; A 1 and A 2 are each independently -N- or -CR 3 -, provided that both A 1 and A 2 cannot be -N-, R 3 is hydrogen; -F, -Cl, -Br, -I or -OH, and A 3 is -NH- or -O-, Q is selected from the group consisting of -(C 1 -C 6)alkyl-; -(C 2 -C 6)alkenyl-; -C(=O)-;-C(=S)-; -S(=O) 2 - or wherein -(C 1 -C 6)alkyl- and -(C 2 -C 6)alkenyl- may be unsubstituted or each independently substituted 1 to 3 -CH 3 groups or halogen atoms, Q 1 is hydrogen; -F, -Cl, -Br or -I, n is an integer of 0, 1 or 2, provided that n is 0 when Q is n is 1 when Q is -C(=O)-; -C(=S)- or -S(=O) 2 -, and n is 1 or 2 when Q is -(C 1 -C 6)alkyl- or -(C 2 -C 6)alkenyl-, and X may be selected from the group consisting of -C 1 -C 6 alkyl; -C 3 -C 6 cycloalkyl; -C 2 -C 6 alkenyl; -C 3 -C 6 cycloalkenyl; -(C 0 -C 2 alkyl)Ar; -OAr; -(C 0 -C 2 alkyl)Het; naphthyl and following groups: wherein R 4 is H or -C 1 -C 4 alkyl, -C 0 -C 2 alkyl, -C 2 -C 6 alkenyl and -C 1 -C 6 alkyl may be unsubstituted or substituted with 1 to 2 -CH 3 groups; 1 to 3 -F groups, or a combination thereof, Ar is a C 6 monocyclic aromatic compound, which may be unsubstituted or substituted with one or more halogen atoms; -OH; -NH 2; -C 1 -C 6 alkyl; -O(C 1 -C 6)alkyl; -C 3 -C 6 cycloalkenyl; -NH(C 1 -C 6 alkyl); -N(C 1 -C 3 alkyl) 2; -CH 2 N(C 1 -C 3 alkyl) 2; -S(=O) 2 -(C 1 -C 3 alkyl) or phenyl groups, wherein -C 1 -C 3 alkyl; -C 1 -C 6 alkyl and -C 3 -C 6 cycloalkenyl may be each independently substituted with 1 to 5 -F or -CH 3 groups, and Het is a 4- to 6-membered heteroaromatic or non-aromatic ring compound containing 1 to 3 elements selected from the group consisting of N, O and S while having 0 to 3 double bonds, and may be unsubstituted or substituted with one or more halogen atoms; -C 1 -C 6 alkyl; -C(=O)(C 1 -C 3 alkyl); -S(=O) 2 (C 1 -C 3 alkyl) or benzyl groups, wherein -C 1 -C 3 alkyl and -C 1 -C 6 alkyl may be each independently substituted with - OH; 1 to 5 -F or -CH 3 groups.