Pyrroloquinoline quinone (PQQ), also known as methoxyplatinum, is a cofactor.

It is found in soil, kiwifruit, food, and human breast milk. It's a little awkward to

say the word "pyrroloquinoline quinone" directly, so most people prefer the

abbreviation PQQ. The scientific journal Nature published a paper by Kasahara

and Kato in 2003 arguing that PQQ is a new vitamin. However, after further study

of pyrroloquinoline quinone, the researchers determined that while it has some

vitamin-like properties, it is only a related nutrient.onobenzone is an organic

chemical used for depigmentation. Monobenzone is soluble in alcohol, benzene,

and practically insoluble in water.