Zembla-4 was an anti-asthma drug that was never actually offered for sale, due to a scandal that occurred around the time that it was going through the approvals process. Calenture-Deutz, the company behind the drug, had concealed a number of deaths among the children that it was tested upon.
The chief scientist on the project was a Dr Phillip Wang – whose murder after he threatened to blow the whistle on the deaths ultimately led to the exposure of the deaths and the utter collapse of Calenture-Deutz.