Nitrogen-containing derivative of substituted phenol hydroxy acid ester, and preparation and use thereof

A compound of formula (I):

• wherein:
• R1-R5 are each independently selected from H, C1-6 linear or branched or cyclic hydrocarbyl, halogen, C1-4 alkoxy, cyano, nitro, ester group,
• R6-R9 are each independently selected from H, and C1-8 linear or branched or cyclic hydrocarbyl, or R6 and R7, or R7 and R8 are optionally covalently linked to form a cyclic hydrocarbyl;
• H in the skeleton of R1-9 are unsubstituted or substituted with a group selected from halogen, hydroxyl, sulfhydryl, carbamoyl, guanidyl, carboxyl, 4-imidazolyl, phenyl, hydroxyphenyl, and β-indolyl;
• R1-9 skeleton optionally contains one or more heteroatoms selected from O, S, and N;
• and
• with provisos that:
• R6 and R7 are not simultaneously H, and when R7 and R8 are covalently linked, R7 and R8 are independently selected from C1-3 alkylenes.