In the title compound, C(20)H(28)O(4), a diterpenoid isolated from the roots of Premna obtusifolia (Verbenaceae), the five-membered ring is in a half-chair conformation. One six-membered ring exists in a twisted-boat conformation while the other is in half-boat conformation. The crystal packing is stabilized by inter-molecular O-H⋯O and weak C-H⋯O inter-actions, generating (001) sheets.

The aim of this study was to identify the type of injuries, severity and common affected anatomical sites in elite dragon boat paddlers with consideration of gender, position in boat and training load of paddlers. The descriptive research was carried out retrospectively. The sample consisted of 302 elite paddlers (159 females, 143 males) from all cities of Iran. Data was collected with a valida...

The title compound, C(10)H(8)O(6), a promising raw material to obtain colorless polyimides which are applied to microelectronic and optoelectronic devices, adopts a folded conformation in which the dihedral angle between the two anhydro rings is 55.15 (8)°. The central six-membered ring assumes a conformation inter-mediate between boat and twist-boat. In the crystal, mol-ecules are linked by we...

This paper investigates small boat fishing on the island of Oahu, Hawaii. We develop a model in which anglers choose where to launch their trailered boats, as well as their ocean destination. The model allows us to study spatial aspects of small boat fishing, including the benefits and costs of attributes of different regions of the ocean, such as fish aggregating devices. Second, it allows us ...

The title mol-ecule, C(19)H(23)NO(4), was synthesized by the reaction of benzaldehyde, ethyl acetoacetate and NH(4)HCO(3). The dihydro-pyridine ring adopts a flattened boat conformation and the plane of the base of the boat forms a dihedral angle of 88.78 (9)° with the phenyl ring. The packing is stabilized by strong inter-molecular N-H⋯O and weak inter-molecular C-H⋯O hydrogen bonds.