A major metabolite or degradation product is considered relevant for additional data requirements if it appears at a level of 10 % of the applied parent compound in any media
Health and Safety Executive (HSE), Glossary of Terms on Biocides and Pesticides, HSE, Merseyside, England, UK 2013. http: //www.hse.gov.uk/biocides/glossary.htm, (Hlth and Sfty - Brit) {701}