Help defining NimbleCSV

I can’t figure out the right definition to parse this string using NimbleCSV.define/2. Everything I try results in an empty list. Can anyone help?

“agency_id\tagency_name\tagency_url\tagency_timezone\tagency_lang\rBART\tBay Area Rapid Transit\thttp://www.bart.gov\tAmerica/Los_Angeles\ten”