carbon monoxide; iron(+2) cation; propanoic acid;ferrous; carbon monoxide; propanoic acid;ferrous; carbon monoxide; propionic acid;Iron, tetracarbonyl[(2,3-.eta.2)-2-propenoic acid]-;Iron, tetracarbonyl[(2,3-.eta.)-2-propenoic acid]-
carbon monoxide; iron(+2) cation; propanoic acid