Methyl (Z)-3-({5-[(E)-(tert-butyl-amino)-methyl-idene]-4-oxo-4,5-dihydro-1,3-thia-zol-2-yl}sulfan-yl)prop-2-enoate.

In the title compound, C(12)H(16)N(2)O(3)S(2), the S-vinyl, and tert-butyl-enamine fragments make dihedral angles of 14.19 (2) and 0.85 (2)°, respectively, with the thia-zole ring. In the crystal, mol-ecules are linked into chains with graph-set motifs C(5) along [100] by C-H⋯O inter-actions. The mol-ecular conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond.

tert-Butyl 6-benzoyl-5-hydr-oxy-2-oxo-2H-chromene-4-carboxyl-ate.

In the title compound, C(21)H(18)O(6), a previously unknown coumarin derivative, the benzoyl substitutent makes a dihedral angle of 53.80 (16)° with the plane of the coumarin rings. An intramolecular O-H⋯O hydrogen bond is observed.

(E)-Dimethyl 2-(6-benzoyl-7-hydr-oxy-4-methoxy-carbonyl-2-oxo-2H-chromen-8-yl)but-2-enedioate.

The mol-ecule of the title compound, C(24)H(18)O(10), a previously unknown coumarin derivative, contains methoxy-carbonyl, 2-butenedioate and benzoyl groups aligned at angles of 28.04 (2), 76.89 (3) and 42.48 (13)°, respectively, to the plane of the coumarin ring system. Intra-molecular O-H⋯O hydrogen bonding between hydr-oxy and carbonyl groups and weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure. The two carbon atoms and attached H atom of the ethylene bond are disordered over two positions, with site occupancy factors of ca 0.9 and 0.1.