A small number or symbol written above and to the right of a chemical formula to indicate the charge of an ion or the number of atoms in a molecule.
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(C6H5)3PNP(C6H5)3(1+)*(Fe3(CO)9(CO)BH2)(1-)=((C6H5)3PNP(C6H5)3)(Fe3(CO)9(CO)BH2)
(1S,2R,4R)-4-tert-Butyl-1-hydroxymethyl-2-methoxy-2-methyl-cyclohexanol
