Where does “glucina” come from?

glucina (New Latin) comes from French glucine, from Ancient Greek γλυκύς, from Proto-Hellenic *dlukús.

Ancestry of “glucina”, step by step

Step	Language	Word	Meaning
1	French	glucine	—
2	Ancient Greek	γλυκύς	sweet
3	Proto-Hellenic	*dlukús	—