What is american base?

Question

Chemical name or formula for american base. Also is EOSIN yellow stain also known as an american base

Answer 1

structure & story is given at:

http://en.wikipedia.org/wiki/Eosin

..."eosin Y (also known as eosin Y ws, eosin yellowish, Acid Red 87, C.I. 45380, bromoeosine, bromofluoresceic acid, D&C Red No. 22)...."

"Eosin Y is a tetrabromo derivate of fluorescein. Its CAS number is [17372-87-1] and its SMILES structure is O=C5C(Br)=C2O C1=C(Br)C([O-]) =C(Br)C=C1C(C4=C (C([O-])=O)C=C C=C4)=C2C=C3Br. "