| synthetic dyes | Organic dye compounds originally derived from coal-tar derivatives; presently produced by synthesis from benzene and its derivatives; examples include eosin, methylene blue, and fluorescein. (05 Mar 2000) |
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| oestrogens, synthetic | Compounds obtained by chemical synthesis which possess oestrogenic activity, but differ in structure from naturally occurring oestrogens. (12 Dec 1998) |
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