<Ul> <Li> CHEBI: 16130 </Li> </Ul> <Li> CHEBI: 16130 </Li> <Tr> <Td> ChEMBL </Td> <Td> <Ul> <Li> ChEMBL416898 </Li> </Ul> </Td> </Tr> <Ul> <Li> ChEMBL416898 </Li> </Ul>

When was ddt first produced in the us