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US4745227A Reversible photochromatic solid 失效
可逆光色固体

Reversible photochromatic solid
摘要:
New compounds having the generic formula: ##STR1## wherein: X=halogen, Y= ##STR2## X=Y= ##STR3## X=Y= ##STR4## R=hydrogen, halogen such as chlorine, lower alkoxy such as methoxy, or lower alkyl such as methyl.These new compounds are useful as reversible photochromatic solids.
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