Need help abbreviating a very long law

cross-posted from: https://beehaw.org/post/12271916

Suppose a law is named something like “The Royal Decree of June 14, 2018 regulating the Distribution of Pharmaceuticals and Vitamins”. If a document needs to refer to that law more than once, it makes a mess and causes some painful reading. How should something like that with a date be abbreviated?

(note that’s a fictitious law similarly named to the law I need to reference; it’s really a question of English and law and lawyers are perhaps best equipped to answer)