text: 1. Yo, we ran some tests on rolipram, real tight,
  In rats, rabbits, monkeys, y'all, we went all night,
  Using 14C and 3H, labeled it right,
  With a radioimmunoassay, we measured the unchanged drug's height.
  
  2. When we gave 'em oral doses, up to fifty a pop,
  Rolipram got absorbed, no time to stop,
  Rhesus monkey, just 0.1% made it through,
  Cynomolgus monkey, 3.7%, rabbit, 3.6%, it's true,
  But hold up, in the rat, 35% was the view,
  And in humans, a whopping 75%, that's how we do!
  
  3. Yo, rolipram broke through the blood-brain wall,
  In the brain, its concentration was twice as tall,
  Plasma levels of the drug, they started to fall,
  Half-life of 1-3 hours, same for all.
  
  4. In rats, we noticed somethin' that wasn't the same,
  Different clearance for the rolipram enantiomers in the game.
  
  5. Labeled rolipram, it left the system quick,
  Elimination through urine, yo, that's the trick,
  Rapid and complete, it made its exit slick.