发明授权
US4146725A Benzofuranyl-benzimidazoles 失效
BENZOFURANYL-BENZIMIDAZOLES

Benzofuranyl-benzimidazoles
摘要:
Disclosed are novel benzofuranyl benzimidazoles and a method for their preparation. The novel benzofuranyl benzimidazoles are useful as optical brighteners for optically brightening a wide variety of synthetic, regenerated or natural organic materials or substances, which contain such organic materials.
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