Declension table of ?antastapta

Neuter	Singular	Dual	Plural
Nominative	antastaptam	antastapte	antastaptāni
Vocative	antastapta	antastapte	antastaptāni
Accusative	antastaptam	antastapte	antastaptāni
Instrumental	antastaptena	antastaptābhyām	antastaptaiḥ
Dative	antastaptāya	antastaptābhyām	antastaptebhyaḥ
Ablative	antastaptāt	antastaptābhyām	antastaptebhyaḥ
Genitive	antastaptasya	antastaptayoḥ	antastaptānām
Locative	antastapte	antastaptayoḥ	antastapteṣu

Compound antastapta -

Adverb -antastaptam -antastaptāt