I am new to the tinker molecular dynamics software. I want to use it for conformation analysis for organic molecules (say penta-alanine). This can be done by SCAN keyword. There manual does not talk about what potential fucntion they are using. When I use it, the program asks me to choose a force field parameter file and my calculations work for CHARRM22.prm parameters only. However, it has a list of multiple different parameter files. Since it is the first time I am using force fields, can anyone help me to know how do I decide what parameter file I am suppose to use?

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