<Tr> <Td_colspan="2"> SMILES (show) <Ul> <Li> CC (Pb) (CC) (CC) CC </Li> </Ul> </Td> </Tr> <Ul> <Li> CC (Pb) (CC) (CC) CC </Li> </Ul> <Li> CC (Pb) (CC) (CC) CC </Li> <Tr> <Th_colspan="2"> Properties </Th> </Tr>

When was lead removed from gasoline in canada