hydrogensulfite sulfite chebi_ontology SO3 sulphite sulfite SO3(2-) A sulfur oxoanion that is the conjugate base of hydrogen sulfite (H<small>₂</small>SO<small>₃</small>). [SO3](2-) SULFITE ION CHEBI:15139 CHEBI:17359 CHEBI:45548 sulfur oxoanion sulfur oxide divalent inorganic anion