Aromatic ring derivative as immunoregulation and preparation method and application of aromatic ring derivative

A compound of formula (I) or a pharmaceutically acceptable salt thereof,

• wherein
• n is selected from 1, 2 and 3;
• R1 is independently selected from H, F, Cl, Br, OH, NH2, CN, CH3, CH2CH3 and CF3;
• R4 is independently selected from H, F, Cl, Br, OH, NH2, CN, CH3, CH2CH3 and CF3;
• or, R1 and R4 are connected together to form a C3-6 cycloalkyl;
• R2 is selected from H, halogen, OH, NH2, CN and C1-3 alkyl, the C1-3 alkyl is optionally substituted by one, two or three R;
• R3 is selected from C3-7 cycloalkyl, C3-7 cycloalkenyl, C2-6 alkenyl and 3-6 membered heterocycloalkyl, the C3-7 cycloalkyl, C3-7 cycloalkenyl, C2-6 alkenyl or 3-6 membered heterocycloalkyl is optionally substituted by one, two or three R;
• ring A is selected from phenyl and 6 membered heteroaryl, the phenyl and 6 membered heteroaryl are optionally substituted by one, two or three Ra;
• ring B is selected from 5 membered heteroaryl, the 5 membered heteroaryl is optionally substituted by Rb;
• Ra is independently selected from H, halogen, OH, NH2, CN and C1-3 alkyl, the C1-3 alkyl is optionally substituted by one, two or three R;
• Rb is selected from H, halogen, OH, NH2, CN and C1-3 alkyl, the C1-3 alkyl is optionally substituted by one, two or three R;
• R is independently selected from H, F, Cl, Br, OH, NH2, CN, C1-3 alkyl and CF3;
• T1 is selected from N and CH;
• T2 is selected from N and CH;
• L1 is selected from
• L2 is selected from single bond, O and S;
• the 5 membered heteroaryl, 6 membered heteroaryl and 3-6 membered heterocycloalkyl contain one, two or three heteroatoms or heteroatom groups independently selected from O, NH, S and N.