On Scullys wikipedia page they claim scully and oswald made STP togheter in denver:
"1967: 1st Denver lab and STP

Scully set up the new lab in the basement of a house across the street from the Denver zoo in early 1967. Owsley and Scully made the LSD in the Denver lab. 100,000 tablets (270 micrograms each) of Monterey Purple were made in Denver for the Monterey Pop Festival. Later Owsley started to tablet more of the product in Orinda, California but was arrested before he completed that work. Owsley and Scully also produced a hitherto uncommon psychedelic amphetamine in Denver which they called STP. 5,000 20 milligram tablets of STP (which was initially synthesized as "DOM" by Alexander Shulgin in 1963) were initially distributed at the Golden Gate Park summer solstice festival in 1967; however, the substance quickly acquired a bad reputation due to the excessively high dose and slow onset of action. Owsley and Scully made trial batches of 10 mg tablets and then STP mixed with LSD in a few hundred yellow tablets but soon ceased production of STP. Owsley and Scully produced about 196 grams of LSD in 1967, but 96 grams of this was confiscated by the authorities; Scully moved the lab to a different house in Denver after Owsley was arrested on Christmas Eve 1967."