The present invention relates to novel antidiabetic compounds, their tautomeric forms, their derivatives, their stereoisomers, their polymorphs, their pharmaceutically acceptable salts, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them. The structure includes a first dielectric layer having a first connection connecting to an underlying interconnect and a second dielectric layer having a second connection connecting to the first connection. Each post aperture is configured to receive a string post of a respective tuning machine, which is then axially secured within respective head stock holes of the instrument.