| abstract |
The present invention provide a compound of the formula:n nwherein X and X' are the same or different and each representsna hydrogen atom, etc.; R 1 and R 2 are the same or different andneach represents a hydrogen atom, etc.; R 3 represents anhydrocarbon group optionally having substituents, etc.; R 4 nrepresents a hydrogen atom, etc.; Y and Ya are the same orndifferent and each represents a bond or a spacer having a mainnchain of 1 to 8 atoms; Z and Za are the same or different andneach represents a hydrogen atom, etc.; or a salt thereof or anprodrug thereof, having a somatostatin receptor bindingninhibitory activity and is useful for preventing and/orntreating diseases associated with somatostatin. |