4,7-dichloroquinoline
... that the availability of the chemical intermediate 4,7-dichloroquinoline facilitated the discovery of hydroxychloroquine in 1949?
... that the availability of the chemical intermediate <b id="mwB0Y"><a href="./4,7-Dichloroquinoline" id="mwB0c" rel="mw:WikiLink" title="4,7-Dichloroquinoline">4,7-dichloroquinoline</a></b> facilitated the discovery of <a href="./Hydroxychloroquine" id="mwB0g" rel="mw:WikiLink" title="Hydroxychloroquine">hydroxychloroquine</a> in 1949?