Levodopa e a barreira hematoencefálica: uma molécula concebida em torno de um problema de transporte
PubChem gives levodopa a computed XLogP3 of -2.7 and dopamine -1.0, so the standard explanation that dopamine is simply too polar to cross cannot be right. The real answer is a transporter with a strict structural checklist.
Methylene Blue: The First Fully Synthetic Drug and Its Second Life in the Laboratory
Synthesised in 1876 as a dye for cotton, methylene blue became the first synthetic compound used as a drug and never left the laboratory. This is its phenothiazinium chemistry, its two-electron redox couple and the analytical methods still built around it.
Do piracetam ao aniracetam: o que um grupo anisoílo muda realmente
Swapping piracetam’s acetamide arm for a 4-methoxybenzoyl substituent changes the nitrogen count, the partition coefficient and the hydrolytic stability of the molecule. This is what that single anisoyl group does, and why plasma assays chase the metabolite instead of the parent.
Química do adamantano: a gaiola de diamante por detrás do Bromantane
A ten-carbon hydrocarbon that melts above 540 K, sublimes instead of boiling, and switches crystal form at 208.62 K without melting. This is the cage chemistry behind memantine, adapalene, saxagliptin and bromantane.
O esqueleto dos racetams: porque é que a 2-oxo-1-pirrolidina-acetamida se tornou uma família química
A five-membered lactam and a short acetamide arm are all that define the racetam skeleton. This is what the 1969 UCB patent actually claimed, where the substituents go, and why levetiracetam proves that a shared core predicts nothing about a target.
Chlodantane: o análogo do adamantano que quase ninguém caracterizou
A PubMed search for chlodantane returns a single Russian-language record from 1999, against 34 for bromantane. This article separates what the structure and the databases actually establish from what is simply absent.
De onde vêm os compostos de investigação: descoberta, síntese e estrutura
Accident, phenotypic screening, target-based design and metabolite follow-up put different kinds of molecule into the literature. This hub maps the routes, and decodes the lab code, the INN stem and the CAS Registry Number that follow a compound afterwards.
As origens acidentais do modafinil: como o adrafinil conduziu a uma molécula mais simples
Modafinil differs from adrafinil by a single oxygen atom, and it was never the target of a discovery programme. It was found by asking what the body did to the compound that came first.