under the guidelines promulgated by the United States Sentencing Commission. (lii) Subparagraph (A) or (B) of section 401(b)(1) of the Controlled Substances Act ( 21 U.S.C. 841(b)(1) ) or paragraph (1) or (2) of section 1010(b) of the Controlled Substances Import and Export Act ( 21 U.S.C. 960(b) ), relating to manufacturing, distributing, dispensing, or possessing with intent to manufacture, distribute, or dispense, a controlled substance, or knowingly importing or exporting a controlled substance, if the sentencing court finds that— (I) the offense involved a mixture or substance containing a detectable amount of N-phenyl-N-[1-(2-phenylethyl)-4-piperidinyl] propanamide, or any analogue thereof