I like Chicago, too. But why can't they just be honest that the song is about taking LSD? It's so obvious; same as with the Beatle's "Lucy in the Sky with Diamonds".
When I was studying for my degree in Chemistry in the early 70's, I learned that the IUPAC name for LSD was Lysergic Acid Diethylamide Tartrate (LSD-25). So of course, being a child of the 60's, I had to go to the main stacks of the library to look up the synthesis in "Beilsteins Handbuch der organischen Chemie", which was the go-to reference on organics. I read a little German, it was required for a BSCh, but Damn, the page had been razored out. LOL. No internet back then, so I never got to make LSD in my dorm room sink.