Prostaglandin F2-alpha(PGF-2 alpha) is a stable prostaglandin that stimulates the contraction of uterine and bronchial smooth muscle and produces vasoconstriction (tightening) in some blood vessels. As a pharmaceutical, the generic name of PGF-2 alpha is dinoprost.
  The most common compound on Earth is water. It's formula is H2O, meaning that in one water molecule, there are two hydrogen (H) atoms and one oxygen (O) atom.  Anoth â¦ er common compound is sodium chloride, which most people know as table salt.ydrogen is the most common atom in the universe, and oxygen is the thrid â¦ most common, so water has to be the number one compound.
Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is the thirâ¦d most common gas in the Earth's atmosphere, at 0.93%. It is more common than carbon dioxide. It is the third most abundant gas and the most frequently used of the noble gases.