Abstract: A compound of formula 1? wherein: V is —CH2—, —NH—, or —O—; Ra and Rb are each independently hydrogen, C1-4-alkyl, or halogen-C1-4-alkyl, or Ra and Rb together are a C2-5-alkylene bridge wherein one or more hydrogen atoms are optionally replaced by halogen; R1 and R1? are each independently hydrogen, C1-6-alkyl, C3-6-cycloalkyl, halogen-C1-6-alkyl, halogen-C3-6-cycloalkyl, or C1-6-alkylene-C3-6-cycloalkyl, or R1 and R1? together are a C2-5-alkylene bridge wherein one or more hydrogen atoms are optionally replaced by halogen; R2, R2?, R2?, and R?? are each independently hydrogen, C1-6-alkyl, halogen-C1-6-alkylene, OH, HO—C1-6-alkylene, —O—C1-6-alkyl, C6-10-aryl, C6-10-aryl-C1-4-alkylene, C6-10-aryl-C1-6-alkylene-O, COOH, COOC1-6-alkyl, O—C1-6-alkylene-COOH, O—C1-6-alkylene-COOC1-6-alkyl, NHSO2—C1-6-alkyl, CN, NH2, NH—C1-6-alkyl, N(C1-6-alkyl)2, NO2, S—C1-6-alkyl, SO2—C1-6-alkyl, SO—C1-6-alkyl, O(CO)C1-6-alkyl, COC1-6-alkyl, NHCOC1-6-alkyl, or halogen; and n is 0, 1, or 2, or an optical isomer thereof