To name conformations of pyranose, first the conformer is determined. The form present in the drug is the thermodynamically more stable conformer. The chair conformation is the most stable conformer. An important factor in the antiperiplanar conformer is the interaction between molecular orbitals. Besides NMR spectroscopy, IR spectroscopy is used to measure conformer ratios. Each conformer is associated with a slightly different SRS spectral signature. The resulting MAD-C-MAD2 complex recruits the open conformer of Mad2 (O-Mad2) to the kinetochores. The most stable is the "GG" conformer. Such as for decamethonium the straight line conformer is clearly the lowest energy state. The conformer shell holds the shape ready for the artificial eye. The conformer is changed every few weeks the first two years of life. The conformer shell will be worn for six to eight weeks after surgery. As the child's face grows and develops, the conformer will need to be changed.