5-ht2a receptor inverse agonist, and preparation method therefor and use thereof

A compound of formula (A) or a pharmaceutically acceptable salt, a stereoisomer or a deuteride thereof:

• wherein R1 is halogen;
• ring B is selected from the group consisting of
• R2 is independently selected from the group consisting of hydrogen, C1-3 alkyl, or C3-6 cycloalkyl;
• each R3 is independently selected from the group consisting of hydrogen, halogen, or C1-3 alkyl, or two R3 attached to the same carbon atom, together with the carbon atom to which they are attached, form C3-6 cycloalkyl;
• ring A is selected from the group consisting of
• X is selected from the group consisting of NR6 or S;
• X1 is selected from the group consisting of N or CH;
• R4a, R4b, R4c, R6a, R6b, R6c, R7a, R7b, and R7c are each independently selected from the group consisting of hydrogen, halogen, C1-3 alkyl, or C1-3 haloalkyl;
• R5 is —OR5′, wherein R5′ is selected from the group consisting of C1-6 haloalkyl, C3-6 cycloalkyl, C3-6 halocycloalkyl, C3-6 cycloalkyl C1-3 alkyl, or C3-6 cycloalkyl C1-3 alkyl optionally substituted with C1-3 alkyl;
• n is selected from the group consisting of 0, 1, 2, or 3.