<Ul> <Li> Interactive image </Li> </Ul> <Tr> <Td> PubChem CID </Td> <Td> <Ul> <Li> 62687 </Li> </Ul> </Td> </Tr> <Ul> <Li> 62687 </Li> </Ul> <Tr> <Td_colspan="2"> SMILES (show) <Ul> <Li> (N+) (= O) (O) (O -). Cl </Li> </Ul> </Td> </Tr>

What is aqua regia what is its use