
1) Coal-tar carbon
Found on
https://www.crosswordclues.com/clue/durene

Durene, or 1,2,4,5-tetramethylbenzene, is an organic compound with the formula C6H2(CH3)4. It is a colourless solid with a sweet odor. The compound is classified as an alkylbenzene. It is one of three isomers of tetramethylbenzene, the other two being prehnitene (1,2,3,4-tetramethylbenzene, m.p. −6.2 °C) and isodurene (1,2,3,5-tetramethylbenzen...
Found on
http://en.wikipedia.org/wiki/Durene

• (n.) A colorless, crystalline, aromatic hydrocarbon, C6H2(CH3)4, off artificial production, with an odor like camphor.
Found on
http://thinkexist.com/dictionary/meaning/durene/
Du'rene noun [ Latin
durus hard; -- so called because solid at ordinary temperatures.]
(Chemistry) A colorless, crystalline, aromatic hydrocarbon, C
6 H
2 (CH
3 )
4 , off artificial production, with an odor like camphor.
Found on
http://www.encyclo.co.uk/webster/D/132
No exact match found.