1-oxa-2-azaspiro[4.5]deca-2,6,8-triene-3-carboxamide, N-[4-[(aminoiminomethyl)amino]-2-hydroxybutyl]-7,9-dibromo-10-hydroxy-8-methoxy-, (5R,10S)- 7,9-Dibromo-10-hydroxy-8-methoxy-1-oxa-2-aza-spiro[4.5]deca-2,6,8-triene-3-carboxylic acid (4-guanidino-2-hydroxy-butyl)-amide Caissarine A InChI=1/C15H21Br2N5O5/c1-26-11-8(16)4-15(12(24)10(11)17)5-9(22-27-15)13(25)21-6-7(23)2-3-20-14(18)19/h4,7,12,23-24H,2-3,5-6H2,1H3,(H,21,25)(H4,18,19,20)/t7?,12-,15+/m1/s rel-(5R,10S)-N-(4-{[amino(imino)methyl]amino}-2-hydroxybutyl)-7,9-dibromo-10-hydroxy-8-methoxy-1-oxa-2-azaspiro[4.5]deca-2,6,8-triene-3-carboxamide