Saveetha University's DFT Study of "DTPB" in Results in Chemistry Describes Penoxsulam, a Rice Herbicide: What It Means for Computational Drug Discovery

A Saveetha University DFT study describes the rice herbicide penoxsulam

Quentir Medicine Monitor

Evidence-based insights for quantum medicine.

A computational chemistry paper from Saveetha University in Chennai presents a fluorinated sulfonamide called DTPB as a molecule with nonlinear optical promise and a possible starting point for drug design. The full chemical name in its title identifies the same compound as the registered rice herbicide penoxsulam, and the paper's abstract does not use that name.

The study appeared in Results in Chemistry, volume 31, as article 103949, and was covered on 11 October 2026 by the science news site Bioengineer.org under the headline that quantum chemistry "reveals hidden power" in the molecule. For a reader who follows computational drug discovery, the paper is a useful case in how to read a calculated portrait of a compound: what the calculations can establish, what they cannot, and what a quick lookup in a public chemical database adds before anyone talks about medicine.

The authors are L. Sasikala, P. V. Avinash, M. Suganthi, A. Suvitha, Sheeba Britto, S. Vimal and Marimuthu Prabhaharan, four of them listed at Saveetha University and one at St. Joseph's Institute of Technology. The article is open access under the DOI 10.1016/j.rechem.2026.103949.

The team used density functional theory, the standard quantum-mechanical method for computing a molecule's electron structure on ordinary computers, at the B3LYP/6-311G(d,p) level. According to the abstract, the optimized geometry is well defined, and the gap between the highest occupied and lowest unoccupied molecular orbitals falls between 4.61 and 4.89 electronvolts across the solvent models used. The authors read that as moderate stability with favorable internal charge transfer.

The headline number concerns optics. The calculated first-order hyperpolarizability is 1.5 × 10-30 electrostatic units, which the abstract puts at about eleven times the value for urea, a common reference material. Maps of electrostatic potential and electron localization point to the oxygen- and nitrogen-containing regions as the reactive sites. A graph-theory section reports topological indices of 170, 201 and 878.