lower alkoxycarboyl and piperidinyl, R11 is a hydrogen atom or a lower alkyl, R12 is a cycloalkyl, or a phenyl which has optionally 1 to 3 substituents selected from a lower alkoxy, a lower alkyl and a halogen atom, W is a group of the formula: --(CH2)p -- wherein p is an integer of 3 to 5, or a group of the formula: --CH???CH--(CH2)q -- wherein q is an integer of 1 to 3, the carbon atom of these