1. Check the numbers below that you would like to view in a side-by-side comparison. RT = Roundup Ready Tolerant. Roundup Ready registered trademark of and used under license from Monsanto Company. SCN or N = Soybean Cyst Nematode resistant. STS = Soybeans Tolerant to Sulfonylurea herbicides. STS is DuPont's trademark for soybeans possessing increased tolerance to sulfonylurea herbicides.