<Tr> <Td> UN 1068 </Td> <Td>? </Td> <Td> (UN No. no longer in use) </Td> </Tr> <Tr> <Td> UN 1069 </Td> <Td> 2.3 </Td> <Td> Nitrosyl chloride </Td> </Tr> <Tr> <Td> UN 1070 </Td> <Td> 2.2 </Td> <Td> Nitrous oxide </Td> </Tr> <Tr> <Td> UN 1071 </Td> <Td> 2.3 </Td> <Td> Oil gas, compressed </Td> </Tr>

What is the subclass of un 1053 hydrogen sulphide