Vincent Chemical Company was an Australian business noted for manufacture of a popular compound analgesic "Vincent's APC" Dr. Harry John Clayton (ca.1887 – 31 October 1928)[1] of Macquarie Street and medical superintendent of the Royal Prince Alfred Hospital, Sydney, took the headache remedy then in general use, composed of phenacetin and caffeine, and by experimenting with the addition of aspirin, arrived at what became the standard formulation known as A.P.C.
Vincent made up the compound, coloured pink, in premises adjacent to his chemist's shop, as 12 envelopes of powder in a box, or as 24 tablets in a small bottle, and labeled as "pain remedy".
Printed instructions for use, supplied gratis by Clayton, were included with each package, bearing the company's trademark "Vincent's APC".
He was still on friendly terms with Probert, and intimated to him that he would like to rejoin the partnership, and on 8 March 1926 wrote to them with an offer, intimating that he had other products with which they could diversify, to which Delany replied on 10 March, stating that none of the shareholders was interested in his proposal, concluding ominously: "As you mention that you are desirous of putting certain new lines of chemical preparations on the Australian market, I have to remind you that perhaps the most valuable asset of the Vincent Chemical Company in this field is now its trademark ... and that it could not permit this asset to be challenged or imperilled.
[8] Phenacetin, a pain-relieving and fever-reducing drug, was banned by the FDA in the US in 1983, due to its adverse effects, which include kidney damage (as shown by Dr. Priscilla Kincaid-Smith)[9][10] and cancer.