. . "Thiophene-2-carbaldehyde" . . "2-formylthiophene, thiophene-2-aldehyde, T2A, 2-thiophenecarboxaldehyde" . . . . "thiophene-2-carboxaldehyde" . . "Thiophene-2-carboxaldehyde" . . . . . . . "Thiophene-2-carboxaldehyde" . . .