P 2825 (OTTO) Pyrrole, 99% Cas no 109-97-7 - used in the electropolymerisation of macroporous conducting polymer films. P 2825 (OTTO) Pyrrole, 99% Cas no 109-97-7 - used in the pharmaceutical industry. P 2825 (OTTO) Pyrrole, 99% Cas no 109-97-7 - used as lightfast red, scarlet, and carmine pigments.