Various configurations of systems that employ leadless electrodes to provide pacing therapy are provided. For a fee it will download a digital photograph onto the patrons storage medium. The fusible link is programmed to an open state by passing a current therethrough that opens the polysilicon and the silicide layers. The compound experiences a solid-solid phase transition whenever the thermal capacity agent melts into liquid form in the compound. The compounds, including all enatiomeric and diasteriomeric forms and pharmaceutically acceptable salts thereof, have the formula: wherein preferably R is substituted aryl and W2 is a heteroatom comprising unit.