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acetylcysteine acid ascorbic atomic atoms benzene biochemistry button caffeine cannabinol cbn chemical chemistry cysteine doodle drawing drawn drug element elements ethanol formula galactose glutation glycerol glycine graphic hand handdrawn icon imitation lactose melatonine model molecular molecule natural niacin outline phosphocreatin pictogram scribble serotonin sign silhouette skeletal sketch sketchy structural sulfite symbol testosterone toluene tryptophan urea vector