<Tr> <Td> Appearance </Td> <Td> white crystalline powder </Td> </Tr> <Tr> <Td> Density </Td> <Td> 1.704 (20 ° C) </Td> </Tr> <Tr> <Td> Melting point </Td> <Td> 184.5 ° C (364.1 ° F; 457.6 K) </Td> </Tr> <Tr> <Td> Boiling point </Td> <Td> decomposes at 187 ° C (369 ° F; 460 K) </Td> </Tr>

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