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ἔσται

Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται -> For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
Corpus Hippocraticum, Aphorisms 1.6.2

French (Bailly abrégé)

3ᵉ sg. fut. de εἰμί.

Russian (Dvoretsky)

ἔσται: 3 л. sing. fut. к εἰμί.