Abstract: Provided is a process for preparing a compound of formula 1 or its salt, which comprises reacting a compound represented by the following formula 4 with acetaldehyde in a mixed solvent comprising water, isopropanol, and methylenechloride in a volume ratio of 1:3-6:11-14 in the presence of a first base to stereospecifically prepare a compound represented by the following formula 3?; and reacting the compound of the formula 3? with an anhydrous compound represented by the following formula 2 in the presence of a second base: wherein R1 is a hydrogen or an amino protecting group, R2 is a hydrogen or a carboxyl protecting group, and R3 is a hydrogen or an amino protecting group consisting of phenylacetyl group, wherein when R3 is a phenylacetyl group, R2 is not a hydrogen in formula 3?; and wherein, when at least one of R2 and R3 is a protecting group, all such protecting groups are removed from formula 3?, thereby producing a compound represented by formula 6 prior to reacting it with the compound o

Abstract: Provided is a process for preparing a compound of formula 1 or its salt, which includes reacting a compound of formula 2 with a compound of formula 3 in the presence of a base.

Abstract: Provided is a process for preparing a compound of formula 1 or its salt, which includes reacting a compound of formula 2 with a compound of formula 3 in the presence of a base.

Abstract: A digital multimedia player that can receive and provide digital multimedia broadcasting (DMB), and a method of providing DMB in the digital multimedia player, the method including: receiving digital multimedia broadcasting; analyzing a user input signal input through a user interface; and changing a broadcast channel, providing a tool menu, and performing audio/video recording of the received DMB in response to the user input signal. Accordingly, the digital multimedia player can provide DMB.

Abstract: Provided is a process for preparing a compound of formula 1 or its salt. The process includes reacting a compound of formula 4 with acetaldehyde in a mixed solvent including water, isopropanol, and methylenechloride in a volume ratio of 1:3-6:11-14 in the presence of a first base to stereospecifically prepare a compound of formula 3 and reacting the compound of the formula 3 with an anhydrous compound of formula 2 in the presence of a second base.

Abstract: Small air conditioner including a heat discharging part including a body having an air inlet in a side and an air outlet in a top surface, a condenser fitted close to an inside of the air inlet, a fan fitted under the air outlet, and a compressor fitted under the fan, wherein external air flows into the heat discharging part through the air inlet, heat exchanged at the condenser, cools down the compressor, and discharged through the air outlet, thereby permitting convenient installation and moving.

Abstract: Small air conditioner including a heat discharging part including a body having an air inlet in a side and an air outlet in a top surface, a condenser fitted close to an inside of the air inlet, a fan fitted under the air outlet, and a compressor fitted under the fan, wherein external air flows into the heat discharging part through the air inlet, heat exchanged at the condenser, cools down the compressor, and discharged through the air outlet, thereby permitting convenient installation and moving.