An efficient synthesis for the preparation of -3-isopropyl-3-{3–7,8-dihydro-1,6-naphthyridin-6-ylcarbonyl} cyclopentyl)-3-methoxytetrahydro-2H-pyran-4-ylamine and its succinate salt are provided. The compounds of the present invention bind to the enzyme reverse transcriptase and are modulators, especially inhibitors thereof. The method further includes computing an operational magnetizing current based on the effective turns ratio and primary and secondary currents of the transformer or primary and secondary voltages of the transformer.