prov:value
| - In the definition of the radicals of the spiropyrane compounds, lower alkyl and lower alkoxy as a rule represent those groups or constituents of groups which contain 1 to 5, and especially 1 to 3, carbon atoms, such as, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl, or amyl and, respectively, methoxy, ethoxy or isopropoxy.
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