| http://www.w3.org/ns/prov#value | - A variety of substituents may be placed on the naphtho portion of the naphthopyran compounds of graphic formula I. For example, the naphtho moiety may be substituted in the positions represented by R5 -R10 in graphic formula I with C1 -C10 straight and branched chain alkyl, C5 -C7 cycloalkyl, phenyl, mono- or di-substituted phenyl, C1 -C4 alkoxy, halogen, i.e. chlorine, fluorine, bromine and iodin
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