"Heroin" was a trademark of Bayer

Bayer was not the first to synthesize morphine into diamorphine (heroin)

wrong info in article:

An Englishman discovered the drug’s compound in 1875. However, 20 years passed before German chemist and Bayer employee Felix Hoffmann synthesized it into heroin.

Correct info:

Heroin also known as Diamorphine was first synthesized in 1874 by C. R. Alder Wright, an English chemist working at St. Mary's Hospital Medical School in London who had been experimenting combining morphine with various acids.

It was marketed as an safe non-addictive alternative for other opioides.