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After a month of contradictions the Food and Drug Administration last week announced the chemical nature of STP, the latest jet-speed psychedelic. Says FDA: it is technically called 4-methyl 2.5 dimethoxy alpha methyl phenethylamine, but is known simply as DOM to the Dow Chemical Co., its discoverers. It is related to mescaline and amphetamine. Dow insists that none of its samples have leaked into illegal drug channels; the formula for making it must have been stolen. But pharmacologists believe that several different mind-shaking concoctions are being distributed to hippies under the magic initials STP, now translated as "serenity, tranquility, peace."