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