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It seems, you have the wrong category code of @. Then TeX will not see the token \@doctitle but the tokens \@, d, o, t, i, t, t, l, e. The first token \@ is filtered out (the command sets the space factor) and the string doctitle remains. In the class file, the category of @ is usually "letter", thus that @ can be used in command names. Maybe you have ...
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