闪亮：从输入文件创建唯一列表

I have been trying for days to create a list from my uploaded file, using Shiny. My file (.csv) is uploaded and shows a table corresponding to the csv-file. However, I have a column named 'Peptide.Sequence', and from that I want to create a list of unique names, as it contains several duplicates (from there I want to be able to give each peptide a user specific value, and so forth, but that's another task). I have been trying for days to create a list fr