Calcilytic compounds

A compound according to formula (I) hereinbelow:

• or a pharmaceutically acceptable salt thereof.
• R1 is selected from the group consisting of H, CN, and halogen;
• R2 is selected from the group consisting of halogen and H;
• R3 is selected from the group consisting of H and C1-5 alkyl, optionally substituted;
• n is 0-5;
• R4 is selected from the group consisting of C1-7 alkyl and cycloalkyl;
• R5 is H or COR4;
• and
• R6 is selected from the group consisting of aryl, fused aryl, dihydro, tetrahydro fused aryl, and heteroaryl, unsubstituted or substituted, with any substituent selected from the group consisting of OH, halogen, C1-4 alkyl, C1-4 alkoxy, CF3, OCF3, CN and NO2.