A pyrazolopyrazine compound of the following formula. A method for making the dual band microstrip antenna includes adjusting the height of the first and second conductive posts to achieve a good performance of the dual band microstrip antenna. The difference between the previous and the new output temperatures is a change in the output temperature. The rear surface of the caster body 52 is formed with a slip-prevention protrusion 58 extending in a right and left direction.