Post 503947 (https://www.thevespiary.org/talk/index.php?topic=12152.msg50394700#msg50394700)
(Bandil: "Synthesis of 4-methyl-3-hydroxy-benzaldehyde", Novel Discourse).Post 428075 (https://www.thevespiary.org/talk/index.php?topic=7409.msg42807500#msg42807500)
(Antoncho: "Benzaldehydes: from nitro to hydroxy in one step!", Chemistry Discourse)