ChemDraw gives this as the ending ---------undecyl)-5-ethyl-1,1,2-trimethylcyclopentane.
so you just need to figure out the ---------bit. So take each substituent and name it and find out the numbering starting from the )-5-ethyl-1,1,2-trimethylcyclopentane end.
Don't forget alphabetical order for the groups and try and obtain the lowest sum of the locants.