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Answer for the clue "Antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA ", 11 letters:
sulfonamide

Word definitions for sulfonamide in dictionaries

Wiktionary Word definitions in Wiktionary
alt. 1 (context chemistry English) Any amide of a sulfonic acid RS(=O) 2 NR' 2 . 2 (context pharmaceutical drug English) Any of a group of antibiotics; a sulfa drug. n. 1 (context chemistry English) Any amide of a sulfonic acid RS(=O) 2 NR' 2 . 2 (context ...

Wikipedia Word definitions in Wikipedia
Sulfonamide or sulphonamide may refer to: Sulfonamide (chemistry) – the sulfonamide functional group in organic chemistry Sulfonamide (medicine) – the group of sulfonamide antibacterial drugs.

WordNet Word definitions in WordNet
n. antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA [syn: sulfa drug , sulfa , sulpha ]

Usage examples of sulfonamide.

Alexander Fleming discovered penicillin in 1928, and the power of the sulfonamides was recognized by drug company researchers in 1935, but antibiotics first came into general medical use in the 1940s and 50s.

This leads me to believe that his secret preparation is unrelated to the sulfonamides, as local therapy is not required when using those.