The formula (I):
wherein each of R
2
and R
3
is, same or different, C2-C4 alkyl or the like; or R
2
and R
3
are taken together with the adjacent carbon atom to form a 5 to 8 membered non-aromatic carbocyclic ring; R
4
is C1-C6 alkyl or the like; X is an oxgen atom or a sulfur atom; A is the group of the formula:
wherein R
1
is, same or different, alkyl or the like; W is C2-C6 alkylene which may contain an optionally substituted heteroatom(s) or the like; n is an integer of 0 to 7, a pharmaceutically acceptable salt, or a solvate thereof.
公式(I):其中R2和R3分别为C2-C4烷基或类似基团,可以相同也可以不同;或者R2和R3与相邻的碳原子结合形成一个5到8元非芳香烷环;R4为C1-C6烷基或类似基团;X为氧原子或
硫原子;A为以下公式的基团:其中R1为烷基或类似基团,可以相同也可以不同;W为C2-C6亚烷基,可以含有一个可选的取代杂原子或类似基团;n为0到7的整数,或其药物可接受的盐或溶剂化物。