25 or 6 to 4?

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The song by Chicago - 25 or 6 to 4
One of the ways the lyrics can be interpreted as, is an LSD trip, and I've read a ton of suggestions that the title of the song stands for a certain type of hallucinogen, supposedly 25R624.

A quick google search gave me a bunch of links to forums saying Chicago's 25 or 6 to 4 really stands for 25R624, but I couldn't find any actual proof that 25R624 is a type of hallucinogen. Anyone know if 25R624 is a type of drug?

 

[NoQuarter]

Chicago fans have long argued about the real meaning of the song. Lamm himself says that the title is "just a reference to the time of day", and that "the song is about writing a song. It's not mystical" [1]. The lyrics "Waiting for the break of day" suggest that the title refers to 3:54 a.m. (6 minutes to 4) or, alternatively, 3:35 or 3:34 a.m. (as in 25 minutes or 26 to 4).

So sez Wiki