... , any material, compound, mixture, or preparation which contains any quantity of the following substances having a stimulant effect on the central nervous system, including its salts, isomers and salts of isomers: (1) Cathine ((+)-norpseudoephedrine). 1230 (2) Diethylpropion. 1610 (3) Fencamfamin. 1760 (4) Fenproporex. 1575 (5) Mazindol. 1605 (6) Mefenorex. 1580 (7) Modafinil. 1680 (8) Pemoline (including organometallic complexes and chelates 1530 thereof). (9) Phentermine. 1640 (10) Pipradrol. 1750 (11) Sibutramine. 1675 (12) SPA (( )-1-dimethylamino-1, 2-diphenylethane). 1635 (f) Other substances. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture or preparation which contains any quantity of the following substances, including its salts: (1) Pentazocine. 9709 (2) Butorphanol (including its optical isomers). 9720 [39 FR 22143, June 20, 1974] Editorial Note: For Federal Register citations affecting ...