Meanwhile, chemical research had identified one previously unknown family of different chemical compounds: esters of phenyl-amino-propanediol. Epidemiological studies had already been made on fatty acid anilides. In view of the existence of these new compounds, further information on them was added for the development of other projects.

Vazquez Roncero A, Maestro Duran R, Ruiz Gutierrez V. New aniline derivatives in Toxic Oil Syndrome . Toxicity in mice of 3-phenylamino-1,3-propanediol and its fatty acid mono- and diesters. Grasas aceites 1984;35(5):330-1.

Schurz HH, Hill RH, Posada de la Paz M, et al. Products of aniline and triglycerides in oil samples associated with the toxic oil syndrome. Chem Res Toxicol 1996;9(6):1001-6.

Schurz HH, Hill RH, Philen RM, et al. Analytical measurements of products of aniline and triglycerides in oil samples associated with the toxic oil syndrome. Arch Toxicol Suppl 1997;19:53-64.