653. I am the manager of a Synthetic Exchange Traded Fund (ETF), which tracks a basket of debt, equity or other holdings in order to provide a return approximating the returns on that basket, but which does not actually hold the underlying debt, equity, or other holdings contained in the basket. May I continue to offer such funds, and may U.S. persons trade in shares of these funds, if the underlying basket being tracked contains holdings in an entity or entities that appear on OFAC’s List of Specially Designated Nationals and Blocked Persons (SDN List), or of an entity owned 50 percent or more, individually or in the aggregate, by an individual or entity on the SDN List?