text: * Methylphosphine and dimethylphosphine (garlic-metallic, two of the most potent odorants known)
  * Phosphine (zinc phosphide poisoned bait)
  * Diacetyl (butter flavor)
  * Acetoin (butter flavor)
  * Nerolin (orange flowers)
  * Tetrahydrothiophene (added to natural gas)
  * 2,4,6-Trichloroanisole (cork taint)
  * Substituted pyrazines