This invention relates to {HEAD ~ novel addition products} of isocyanates with oxyalkylene substituted arinophenol compounds as {TAIL ~ intermediates} for the production of urethane substituted xanthene colorants, particularly triphenylmethane derivatives such as rhodamines 
This invention relates to { HEAD ~ novel addition products } of isocyanates with oxyalkylene substituted arinophenol compounds as { TAIL ~ intermediates } for the production of urethane substituted xanthene colorants , particularly triphenylmethane derivatives such as rhodamines
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