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Rule 7. Watch out for the following frequent errors: a. 0 for C and vice versa in the first member of a side chain.b. Cyclopentyl or cyclohexyl rings with just a vertical double bond implying a methylene group where C = 0 is meant. c.Careless usage of the solid, dotted, and wavy lines to show known or unknown stereo bonds. Once a paper uses a dotted or wavy line, one would expect that the solid lines mean something, but this is not always the case.d. Beware of the 5-position in steroids. The hydrogen at this position can be either «(dotted) or /¡(solid). Authors often fail to indicate which it is, even where this can be determined from flow sheet or context. e.Trade and nonproprietary trivial names often imply more than they say. Where an author says Demerol he means meperidine hydrochloride. Biochemical literature is loaded with articles referring to epinephrine where epinephrine bitartrate is meant. Recent issues of CBAC have made a false distinction between 2-isopropylamino-T(2-naphthyl)-ethanol, Registry No. 54808, and its hydrochloride, No. 51025, under the false assumption that the trade name Nethalide refers to the base. It is the hydrochloride.f. It is easy to confuse pyrrolidino with pyrrolidono. g. In phenothiazines, the U. S. 3-substituent would often be called a 2-substituent in European literature. This confusing designation will be carried over to CA if the name appears in the title, but may be corrected in the CA Index. It will not be corrected in CBAC.h. Italic lower case p is often confused with Greek rho, and rho with sigma.i. In dosage statements, check milligrams vs. micrograms.