Declension table of āntra

Neuter	Singular	Dual	Plural
Nominative	āntram	āntre	āntrāṇi
Vocative	āntra	āntre	āntrāṇi
Accusative	āntram	āntre	āntrāṇi
Instrumental	āntreṇa	āntrābhyām	āntraiḥ
Dative	āntrāya	āntrābhyām	āntrebhyaḥ
Ablative	āntrāt	āntrābhyām	āntrebhyaḥ
Genitive	āntrasya	āntrayoḥ	āntrāṇām
Locative	āntre	āntrayoḥ	āntreṣu

Compound āntra -

Adverb -āntram -āntrāt