Cycloartane tetracyclic triterpenoid compound, preparation method therefor and use thereof

A compound of general formula (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof:

• wherein,
• X represents —OH, ═O, ═NORa, or ═NOCORb, wherein Ra represents hydrogen, methyl, ethyl, propyl, isopropyl, or butyl;
• Rb represents C1-C10 alkyl, C2-C10 alkenyl, or C6-C12 aryl optionally having a substituent, wherein the substituent is selected from halogen, methyl, ethyl, hydroxy, amino, sulfhydryl, phenyl, methoxy, ethoxy, cyano, nitro, acetoxy, acetylamino, carboxy, a methyl carboxylate group, or an ethyl carboxylate group;
• R1 represents hydrogen, hydroxy, ORc, or OCORd, wherein Rc represents methyl, ethyl, propyl, isopropyl, butyl, pentyl, cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl;
• Rd represents C1-C10 alkyl, C3-C10 cycloalkyl, C2-C10 alkenyl, C6-C12 aryl, or heteroaryl optionally having a substituent, the heteroaryl being a monocyclic or fused ring having 5 to 12 ring atoms and containing 1 to 4 ring heteroatoms selected from N, O, or S, the remaining ring atoms being C;
• wherein the substituent is selected from halogen, trifluoromethyl, methyl, ethyl, hydroxy, amino, sulfhydryl, phenyl, methoxy, ethoxy, cyano, nitro, acetoxy, acetylamino, carboxy, a methyl carboxylate group, or an ethyl carboxylate group;
• R2 is selected from hydrogen, halogen, methyl, ethyl, propyl, isopropyl, butyl, pentyl, cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl;
• and
• R3 is selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, pentyl, cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl,
• with a compound wherein X represents ═O, both R1 and R2 represent H, and R3 represents CH3 being excluded.