Commission Delegated Regulation (EU) 2017/569 of 24 May 2016 supplementing Directive 2014/65/EU of the European Parliament and of the Council with regard to regulatory technical standards for the suspension and removal of financial instruments from trading

RTS specifying when derivatives related or referenced to a financial instrument suspended or removed from trading must also be suspended or removed, depending on how closely their price depends on that instrument (for example, single-underlying derivatives versus index derivatives).